Lighting calculation of the living room. Calculation of LED lighting in the apartment

In electrical engineering, there is such a thing as room illumination calculation. This calculation is the basis

the entire lighting part of the wiring, so it should be given special attention. In this article, we will analyze in detail:

• Why do calculation of room illumination?
• What should be paid attention to and what should be taken into account when planning lighting.
• What are the rules for lighting residential premises?
• How to calculate the illumination of a room, calculation example

Now, about everything in order.

Why do lighting calculations?

First of all, this calculation is necessary to create sufficient illumination of the room, which in turn provides favorable and comfortable conditions for human life and health.

The lack of lighting or its excess causes severe eye strain, fatigue and exerts negative psychological pressure, which adversely affects human health in general.

What should I pay attention to when planning room lighting?

The ideal lighting for our eyes is natural natural light (daytime, morning or evening sun, sun behind the clouds).

The main task of calculating the illumination of a room is the maximum approximation of artificial lighting to natural. Artificial lighting refers to light that a person has the ability to control.

Electric light, is artificial, it is obtained as a result of the transformation electrical energy in one of the types electromagnetic radiation which is perceived by the human eye as light. It is this transformation that occurs inside the lamps installed in the housings of electrical lighting installations (lamps, chandeliers, sconces, floor lamps, and so on).

• Incandescent lamp (Ilyich's light bulb)
• Halogen lamp
• Fluorescent Lamp
• Compact fluorescent lamp
• discharge lamp

Each of these lamps has its own characteristics, features, advantages and disadvantages. Therefore, making a choice in the direction of a particular lamp, you need to consider the following things:

• Lamp power
• Light flow
• Color reproduction

These data are indicated by the manufacturer on the packaging of the lamp, based on them, we can choose the required illumination for a particular room.

Lamp power- determines the amount of electricity consumed by the lamp, measured in Watts (W)

Light flow- the amount of light emitted by the lamp, measured in Lumens (lm).

Color reproduction– consists of color temperature and hue. Color temperature is measured in the range from red 1800K to blue 16000K. It is measured in Kelvin (K). Hue, for most types of lighting lamps, can be warm or cold light, sets the overall tone of the light flux.

Color rendering table for some light sources.

Table #1

How less value, the chromaticity is closer to red, the more, the closer to blue. For example, a 100-watt incandescent lamp familiar to all of us has a color value of 2800 K.

Now, let's talk about such concepts as luminous flux and luminous efficiency.

Luminous flux - the amount of light emitted by the lamp.

Luminous efficiency - the ratio of luminous flux to power (lumens per watt, lm / W), an indicator of the efficiency of the lighting capacity of the lamp, as well as its efficiency.

For clarity, below is a table of luminous efficacy of some light sources.

Table number 2. Luminous flux and luminous efficiency of some types of lamps.

The table shows how the performance of different lamps differs. That is why, the choice should be given special attention.

Likewise, a lot important role lighting structures play in the illumination of the room, in which the selected lamps (chandelier, lamp, sconce) will be installed.

Here, the main factors are:

• Installation location (wall or ceiling)
• Installation height,
• The presence of decorative shades, their transparency,
• Where is the lamp in the lamp directed (up, down, sideways).

An open lamp will give more luminous flux than a lamp closed with an opaque shade. The higher the lamp is installed from the floor, the more light will be from it, respectively, the lamp mounted on the ceiling will illuminate the area more than the lamp installed on the wall.

It is worth noting another very important point, which must be taken into account when calculating the illumination of the room. Color of walls and furniture. It's no secret to anyone that bright hues reflect light, while dark ones absorb. When using dark color solutions in design, be prepared for light losses due to color.

Norms of illumination of residential premises

In order to know how much lighting a particular room needs, the main construction department has developed special regulatory rules that are spelled out in the documentation called SNiP ( building codes and rules). Below, in the table, the norms of illumination of residential premises are given, according to these rules.

It is worth clarifying that the concept of illumination refers to the required amount of light flux per 1 square meter of a room. Illumination is measured in Lux (Lx).

Below is a table of illumination of residential premises in accordance with the requirements of SNiP. Using its values, you can easily perform a fairly simple calculation yourself. Let's look at how to perform it using a specific example after the table.

Table number 3. Norms of illumination of residential premises, according to SNiP

Calculation of room illumination, calculation example

Let me remind you that illumination is measured in lux, 1 lux \u003d 1 lumen per square meter

As an example, let's calculate the illumination of a kitchen with an area of ​​7 square meters.

Referring to table number 3, the illumination rate of 1 square meter of the kitchen is 150 Lux.

150 Lx * 7 m 2 \u003d 1050 Lx

It turns out that to illuminate the kitchen, we need an illumination of 1050 Lx.

And since 1 Lx \u003d 1 lm / m 2, it turns out that to illuminate a kitchen with an area of ​​\u200b\u200b7 meters, a luminous flux of 1050 Lm will be required.

Now, according to table No. 2, we select the lamps that will be used in the kitchen lamp, suitable for us in terms of the amount of calculated luminous flux.

Let's say that we want to make the lighting of the kitchen with incandescent lamps. We look at table No. 2, which corresponds to a luminous flux of 1050 lm. A typical 75 W incandescent lamp produces 935 lm, which is almost the same as the result obtained in the calculations. Alternatively, you can also use halogen lamp incandescent for a voltage of 230 V, a power of 70 W, its luminous flux is 1170 Lm.

Before we make our final choice, there are two more points to consider:

1. Color Rendering Lamp
2. Luminaire configuration

The color rendering of an incandescent lamp made as standard (with clear glass), always equals the same value of 2750 K, has the same shade of light. Therefore, here we do not choose anything. But, if, for example, our choice fell on a compact fluorescent lamp, then here, it would be necessary to choose a shade of light, cold or warm, and color rendering. For cold shade lamps - color rendering starts from of blue color up to white, for lamps warm shade- from white to red.

Now, let's analyze the configuration of the lamp. Let's say our lamp will have a matte shade that will cover the lamp. Here, it is worth considering that such a ceiling has its pros and cons. The pluses include the soft distribution of the light flux around the room. By the way, some loss of light, due to its refraction by the ceiling.

How to be? Again we turn to table No. 2, we look at the following value of the luminous flux of the lamp we have chosen in the big direction. Next, after the 70 W lamp (935 lm,) comes the 100 W incandescent lamp, the luminous flux of which is 1340 lm. We choose this lamp, it compensates for the loss of light flux in the lampshade.

I want to note another very important point. Before choosing a lamp for a lamp, you need to look at how many watts its cartridge is designed for. As a rule, the cartridge has a sticker or inscription with such information. This is especially true when using incandescent lamps and halogen lamps in lamps, since in addition to light they also produce heat. For example, if a 100 W lamp is installed in a cartridge designed for a maximum lamp of 60 W, then it will melt.

Let's sum up our calculations

Having calculated the lighting of the kitchen room, the area of ​​\u200b\u200bwhich is 7 square meters, we have found that 1050 Lux will be enough to illuminate a particular room, according to the norms of SNiP.

This room will have one ceiling light ilnik with matte finish. Taking into account the configuration of the lamp, it was decided to increase the power of the lamp from 75 to 100 watts.

Based on the results of the calculations, a 100 W incandescent lamp will be installed in the kitchen ceiling lamp.

Thanks to the calculations performed, we obtained sufficient illumination of the room, which will definitely have a positive effect on the health and comfort of the people in it.

What is the correct room lighting? For everyone, this concept is different, as someone loves the twilight, and someone prefers bright lighting. But lighting engineers will be able to calculate the correct and most efficient lighting for each room, taking into account energy savings. To calculate the amount of light is to perform a set of work on the selection and placement of lamps in a room, as well as calculate energy consumption. In this article, we will tell readers how to calculate the illumination of a room by providing the most popular methods and formulas.

Ways to calculate lighting

Coefficient Method

Lighting plays an important role in people's lives. Calculate it very simply by the coefficient method. First of all you need (N).

100*S*E*Kr is the definition of glare, where:

• S is the area of ​​the room;
• E - light level of the horizontal plane (indicated in lux);
• Kr is the safety factor (for a house it is 1.2).

U*n*Fl- calculation of the brightness of the lamps, where:

• U is the coefficient of light consumption by the device (depending on the number of lamps);
• n is the number of lamps in the device;
• Fl is the luminous flux of one lamp (measured in lumens).

For example: A workplace (such as an office or kitchen) uses 3 lights. We substitute the data into the formula: 3 = E (cabinet) * 100 * 1.2 (standard illumination). It remains to calculate the brightness of the lamps. And for this you need to know the coefficient of light consumption (U).

• h1 - the height at which the lamps are located;
• h2 - height working surface;
• a and b - the length of the walls, the area of ​​\u200b\u200bthe room is known.

After calculating the value, for a complete miscalculation, it is necessary to find out the remaining data. In the reference book, you need to look at the indexes of the reflectivity of the materials of the ceiling and walls. The coefficient of light utilization will be lower if the walls are light. By substituting all the data obtained into the formula, you can calculate the illumination of an apartment or room. Based on the example, then for a room with three lamps, the following result is needed:

Based on the results obtained, it was decided that the illumination of the room should consist of 12 individual lamps that are built into the ceiling. Three lamps were rejected.

All reference materials available on the Internet, as well as below in the article, so there is nothing difficult to calculate. There are many similar calculations in order to calculate illuminance.

By specific power

This technique uses data from directories, so it is considered simple. The disadvantage of this method is a large margin in the calculation, which makes it difficult to calculate the cost of electricity and its savings. If you look at the fact, then this is a method for estimating the cost of electrical energy. If there is a specific power of light, then it is enough to multiply the number of lamps by the power and divide by the area. The resulting number can be used to determine the approximate power and number of lamps.

This calculation makes it possible to distribute the lamps over the area of ​​​​the room. And this means that using this method you can find out the lighting at a certain point in the room. To proceed with the calculation using this technique, it is necessary to develop a floor plan, determine the calculated point and place the fixtures.

This method is complex, therefore it is used when the complex surface of walls or ceilings or for design solutions. If you look from the side of saving electricity, then this method is considered the most economical.

Application of the prototype

For this method, a table from the reference book is used, where the exact miscalculations of standard rooms are registered. Such miscalculations were carried out more than once, so the data that is written in the table is correct. There are more unusual methods and formulas for determining the level of light, but they are expensive and are used only for rooms. complex design and planning or for . It makes no sense to use them for a residential apartment.

What is important to know?

1. Accounting for all necessary requirements and norms.
2. Compliance with electrical and building codes.

For ordinary residents, these standards are not so important, but they must be observed. For example: a staircase in a private house. If you make a calculation, it will be seen that it needs lighting as in the workplace. But in practice there are various situations when five luminaires with LED lamps are sufficient. At the same time, 6 more cables remained unused in the wall, which were laid there based on a miscalculation. Therefore, do not rush to spend extra money and do it.

Or one more example. The owners decided to turn the living room into a children's room. Lighting in this case should be in the floor area. But there was no way to direct the light flux towards the floor, so we had to use local lamps, which is not very convenient.

Therefore, the calculation of light is important to do when designing. electrical network Houses. If during construction you need to change something, then it is best to make a new calculation.

Reference materials

The tables below show the data U (coefficient of light use), which are written in the first formula. This is the illumination of the horizontal plane:

Lighting in the house is an important component of a comfortable stay in it. In our world daylight cannot satisfy all the needs of people, and in an apartment without artificial sources light is just not enough.

However, not everyone knows that there are special standards for calculating the level of illumination for each room. According to them, you should calculate the number of light bulbs that should be installed for each particular room. How to do this and why it is needed at all will tell our article.

Light value

Poor lighting is the enemy of vision

The role of light in Everyday life it is difficult to overestimate, because without lighting the comfort of our home will be greatly reduced. Light has an impact not only on the safety of our movement around the apartment, but also on health indicators. If the room is illuminated by an insufficient number of lamps, the following health problems may occur:

• significant loss of visual acuity. In the very bad case you may need glasses and a consultation with an ophthalmologist;
• decline general health household members;
• the appearance of excessive irritability;
• a drop in immunity and an increase in the incidence of colds;

Note! Incorrect lighting of the room especially negatively affects the health of children.

• decrease in work productivity;
• sleep disturbance;
• decrease in the emotional background of the household.

As you can see, for each room it is necessary to calculate the required number of light bulbs, with the help of which sufficient lighting of the room will be created.

As we found out, the illumination in the house plays huge role. Lamps should give as much light as necessary for a particular room.
In an apartment or a private house, each room has its own purpose and features of operation (kitchen, bedroom, living room, corridor, etc.). Special attention in this matter, it is necessary to pay attention to the children's room, since for children even a slight deviation of the light flux from the norm can lead to a negative effect on the body. Each room should have its own indicator of the number of light bulbs and fixtures.
To calculate the number of lamps that you need for a particular room, you should use special formulas. Ideally, illumination should be taken into account at the design stage of buildings and rooms. At proper planning lamps will give enough light for a comfortable stay of a person in a particular room.

Lighting design

The degree of illumination is regulated by some legal acts that are part of the SNiP (building codes and rules), as well as SanPiN ( sanitary norms and rules). These documents at the regional level are supplemented by various acts and industry documentation.
The documents for private houses and apartments contain recommended and minimum standards regarding illumination. They are indicated in Lux per m2.
Note! In this documentation, 1 Lux is taken to be the illumination that is available in the tropics during the full moon. At the same time, incandescent lamps of 100 watts give illumination of 1350 Lux.
It is necessary to calculate the required number of light bulbs for each room according to the regulatory documentation with minor adjustments, since only the minimum values ​​\u200b\u200bare given here.

Lighting types

Before proceeding with the calculations of the required number of light bulbs, it is necessary to understand what kind of lighting happens. So, as you might guess, it can be of two types:

• natural;
• artificial, which is created by lamps. It is for this type of lighting that calculations will be made on the number of light bulbs.

artificial lighting

In its turn artificial lighting can create the following types of light bulbs:

• incandescent lamps;
• LED bulbs. These are the so-called LED-lamps. In this context, it is necessary to consider separately Led lamps and Led strips, which work on the same principle;
• fluorescent lamps;
• halogen lamps. Separately, it is worth noting that among the halogen types of light sources there are some more subspecies. This must also be taken into account in the calculations;
• neon lamps.

Luminous flux of lamps

Each of the above types of light bulbs creates lighting in a certain range in Lux. Therefore, when calculating, it is necessary to take into account the type of lamp that will create light in the room.
At the same time, do not forget that artificial light sources can create the following lighting:

• general. In this case, the illumination of the room is carried out using a centrally located lighting fixture. Often a chandelier plays its role;
• combined. Distinctive feature of such illumination of the room lies in the fact that local lighting is formed here - the zoning of the room is organized using lighting fixtures. In addition, each zone may differ in the degree of brightness of the light.

Lighting calculation

The lighting design is difficult process determining the required number of light sources for each individual room. It is carried out by several methods and requires taking into account all the parameters of the room, its technical and physical characteristics, as well as estimates of the type of light bulbs used.
Note! Accuracy in calculating the required number of lamps for rooms in apartments and houses does not require such accuracy. Enough to fall within the acceptable range to prevent Negative influence on the human body.
But here you need to take into account some caveats:

• the luminous flux that the lamps create. They may be different types. Particular emphasis should be placed on halogen and LED lamps, as they have another gradation in terms of luminous flux;
• ceiling height (in rare cases, the distance from the floor to wall lamp). This indicator may be different, since all the buildings of the last century, of which the prevailing majority in our country, were built according to different architectural ideas. This parameter can be varied by choosing, for example, low-hanging chandeliers with high ceilings;

Ceiling height is important

• the purpose of the premises. For the kitchen and children's room, more light is needed than for the corridor or bedroom.

In all other respects, in the course of the calculations, it is necessary to rely only on the individual indicators of the lamps. In this case, the main indicator of the calculations will be the specific power of the lamp. It is determined by the amount of electrical power consumed by the product (not to be confused with light) per 1 m2 of the room. It is this indicator that is indicated on all bulbs in the form of markings.
The electrical power for each room has the following indicators:

• living room and office - 22 W per square meter;
• bedroom - 15 W per 1 m 2;
• kitchen - 26 W per 1 m 2;
• children's room - 60 W per 1 m 2;
• bathroom - 20 W per 1 m 2;
• corridor - 12 W per 1 m 2.

The above parameters are considered relevant for halogen and conventional lamps. In a situation where luminescent light sources are used, the above norms must be reduced by 2.5-3 times. For LED lamps- reduce by 10 times.

Lamp power

In addition, this indicator will also be based on the type of lighting device (chandelier, Spotlights etc.).

How we count

To calculate the number of required lamps for a room, you must be guided by the principle of rounding fractions up. This means that when obtaining, for example, a value of 36 W for a small corridor, it is better to use two 25 W bulbs than one 40 W.
Note! In this regard, it is also necessary to evaluate color scheme premises. In the presence of dark tones in the design, preference should be given to brighter light sources.
To get specific numbers, you need to use the formula for calculating spots. Here for calculation optimal level necessary lighting the following formula applies:
N = (S * W) / P, where these indicators denote the following quantities:

• N is the number of lamps in the room. Measured in pieces;
• S is the area of ​​the existing premises. Measured in sq.m;
• W is the specific power of the luminous flux emitted by the bulbs. The parameter indicates the level that is required to create optimal lighting. For each lamp, this indicator is different. Measured in W/sq.m;
• P - power for one lamp. Measured in W.

Remember that the figures obtained during the calculations may fluctuate slightly, but nevertheless they will be as close as possible to the real single parameters.
To make it clear, we give an example of calculations. Let's choose the following options:

• room type - living room;
• type of lighting - basic;
• lamp type - LED;
• spot power (average) - 5 W;
• room area - 20 m2.

The specific power indicator is taken from the table or calculated approximately, as indicated above. For an LED lamp, it is W = 3 W / sq.m. We insert all the indicators into the formula and get N = (20 * 3) / 5 = 12 pcs.
You can also use another formula to determine the illumination:

Lighting in the living room

P=pS/N, where the indicators are deciphered as follows:

• P - illumination;
• p - specific lighting power. For incandescent lamps, the average value is p \u003d 20 W / m2, for halogen lamps - 30 W / m2, for fluorescent -10 W / m2, for LED -3 W / m2. Measured in W/m2.;
• S is the area of ​​a particular room in m2;
• N is the number of fixtures available.

Using the above formulas, you can easily calculate the required number of light bulbs for each room in your house or apartment.

Some nuances

The above formulas for the calculation give average indicators, so they can be slightly reduced. For example, if the room is rarely visited (pantry, corridor), then the number of light bulbs can be slightly reduced, but for frequently used ones (children's room, living room, kitchen), a slight excess of the calculated norm is allowed. In addition, you can use combined lighting, which allows you to additionally highlight a certain area of ​​\u200b\u200bthe room.
As you can see, the calculations are not so complicated, but they are necessary for your health and comfortable pastime at home.

Making an original bio-fireplace on your own

R calculation led lighting allows you to organize an effective lighting system. One of the main features of such lamps is the high brightness of the light, and, in addition, they are characterized by directional radiation, which under certain conditions is a plus, in others - a disadvantage. In order for the room to be lit by diode lamps as evenly as possible, you should use some tricks.

Room lighting standards

The efficiency of light radiation in the apartment should be different. If in any of the rooms the glow is equally bright, directional or, conversely, diffused, then the level of comfort will noticeably decrease.

Room lighting standards

Therefore, in rooms of different designated purpose SNiP provides for several levels of illumination:

• entrance hall of the apartment - 100-200 lux;
• home office - 300 lx;
• living room - 150 lux;
• bedroom - 200 lux;
• kitchen - 150-300 lux;
• children's - 200 lux;
• bathroom - 50-200 lux.

The area of ​​the room and its height are key factors in determining the sufficient brightness of the light. Much depends on the type of lighting: main light; local; functional; decorative lighting. The norms indicate different indicators of illumination for some rooms.

When creating a functional lighting system, the luminaire should emit a brighter light. Decorative lighting involves the need to install lamps of low efficiency. The named indicators of illumination are suitable for residential premises with a height of 2.5-3 m.

How to achieve uniform lighting?

If LED emitters are involved, then their location should be considered, taking into account the main parameter - the luminous flux. The brighter the radiation of the lamps, the further they are installed from each other.

To cover the entire area of ​​​​the room or a separate area, it is recommended to pre-calculate a sufficient number of lamps.

Uniform ceiling light is organized by mounting different types of lighting elements. You can choose from various combinations: a central luminaire (chandelier) and spotlights installed along different schemes; several ceiling fixtures of the main light and decorative light; point emitters in the right amount and with suitable characteristics, used in the organization of the main light without the use of a chandelier.

Determining the level of illumination

The total intensity of the glow of lamps for rooms of different purposes is determined as follows:

• F \u003d E * S * kz,
• where E is the illumination of 1 sq. m;
• S is the area;
• Kz - safety factor.

The last of these parameters directly depends on the installation height of the fixtures and reflectivity different surfaces(walls, ceilings, floors). For housing, but only if diode-based lamps are installed, this figure is 1.1.

Brightness levels

As an example, consider the calculation of LED lighting for a nursery:

F \u003d 200 * 6 * 1.1 \u003d 1,320 lm.

Accordingly, in such conditions, it is necessary to use emitters that are characterized by a luminous flux of the desired value, so that in total it is possible to obtain a value of 1,320 lm.

How many lamps do you need

There are different formulas for calculating the number of lamps and appliances. Much depends on their type. For example, in point models, only one light source is usually installed, respectively, in order to calculate the number of such devices, you need to divide the total illumination (F) by the luminous flux of one emitter.

If there is another task: to determine how many lamps with several bulbs are required, then it is recommended to apply the following formula:

• N \u003d (E * S * kz * z * 100) / (n * F * ɳ),
• where E is the normalized illumination, lx (table value);
• S is the area of ​​the room, sq. m;
• kz - safety factor (1.1);
• z is the value of illumination unevenness (for diode lamps it is equal to 1);
• Ф – emitter luminous flux, lm;
• ɳ - coefficient of the lighting element (equal to 1);
• n is the number of lighting elements in one fixture.

As a result, you can accurately calculate the desired level of illumination and find out how many lighting fixtures you need to install. In any case, it is always better to be guided by approximate data than to organize lighting “by eye”.

The type of light bulbs used should also be taken into account. They may differ in base (threaded, pin), color temperature (from warm to cold shades), power.

In particular, diode emitters for the home are characterized by a small load on the network: from 3 to 15 watts. This is enough to provide bright light for residential areas.

Thus, the total illumination of the room will depend on the number of devices. But, besides this, the parameters of the lamps must be taken into account: color temperature, luminous flux, power. To get a uniform glow using LED devices, you need to be guided by calculations, otherwise some parts of the room may not be well lit, while others, on the contrary, are too brightly lit.

You can choose any of existing schemes lighting. The most commonly used options: with a chandelier and spot lighting; without the main lighting device, spotlights provide functional light.

Purchase new apartment or renovating an old home is a great way to reconsider your attitude to the topic of lighting, to abandon the traditional massive chandeliers and incandescent bulbs.

Contemporary Housing Design and Opportunities construction technologies allow you to come up with and implement any lighting schemes, depending on the purpose of the room. The main pleasure is that everyone can choose the type, number and power of lighting fixtures to suit their requirements for the level of illumination.

But besides our desires, there are norms and requirements that must be followed.

Requirements and wishes for lighting arrangement

Before proceeding with the planning and calculation of the lighting system of the room, it is necessary to formulate what basic criteria it must meet.

The main ones are:

• Comfortable illumination, that is, light enough for reading, communication, homework, but does not hurt the eyes. This indicator is different for everyone, as it depends on the state of vision, habits and preferences.
• Convenient placement of lamps, which should give light to the entire area of ​​​​the room, but the level of illumination may differ in different parts rooms.
• Profitability, namely, the amount of the monthly payment for electricity, the cost of the bulbs themselves (for one and for the entire quantity), the service life of the bulbs (how often they will have to be bought).

Considering all these requirements, then optimal solution will be the choice of LED lamps. They are equivalent to incandescent lamps in terms of light level, but consume much less electricity and last for several years. Compared to energy saving fluorescent lamps LED counterparts are more compact in shape and have a pleasant glow. Now you need to make a calculation of the illumination of the room with LED lamps in order to calculate how many and what power lamps are needed for sufficient lighting.

What data is needed to calculate the level of illumination

There are several ways by which you can calculate the number and power of LED lamps. Before proceeding with the calculations, it is necessary to figure out which indicators will be involved in them.

The list of variables and constants, on the basis of which LED lighting is calculated, consists of the following items:

• The area of ​​\u200b\u200bthe room, that is, the product of the length and width of the room. Calculations are made based on the fact that the room has rectangular shape. With a more complex architecture, it is necessary to conditionally divide the space into regular figures and add up their areas.
• Correction factor that takes into account the height of the ceilings. Since the light spreads not only over the area, but throughout the entire volume of the room, the brightness of the lighting directly depends on the height of the ceilings. Use a special table of coefficients. For example, a ceiling height from 2.5 to 2.7 m is a coefficient of 1, up to 3 m - equal to 1.2, up to 3.5 m - 1.5, then a correction indicator is used - 2.
• Another standard is the level of illumination, for the calculation of which special tables have also been compiled for residential, utility, commercial and industrial premises. The indicator is measured in Lux (lux).

The most popular indicators are as follows:

1. bathroom, toilet, basement, corridor are treated as utility rooms, and the level of illumination in them ranges from 20 Lx (in the basement) to 50 Lx (in the corridor).
2. living rooms are estimated in the range from 150 to 300 Lx, minimum performance in the bedroom and kitchen - 150 Lx, maximum level in the office and children's room - 300 Lx.

Additionally, in the calculations, indicators such as:

• cleanliness of the room (dust level);
• finishing materials and ceilings (dark, light, glossy).

The easiest way to calculate the illumination of a room with LED lamps

The easiest way to calculate the illumination of a room with LED lamps is as follows:

Calculate the desired amount of luminous flux (in lumens).

To do this, simply multiply the known values:

room area × illumination rate × correction factor for ceiling height.

For example, the area of ​​​​the room is 15 m², the ceiling height is 2.5 m, which means that the coefficient equal to one, room - kitchen, for which the illumination rate is 150 Lx

As a result, we get:

15×150×1= 2250 lumens(lm).

The second step in the calculation is the calculation of the quantity and power LED light bulbs. Here you can do it in two opposite ways.

1. Divide the total luminous flux by the wattage of the lamps to get the number of lamps. In this case, the power of the luminous flux is usually indicated on the packaging of the light bulb, and it does not equal the power. For example, a 10W lamp produces 800 lumens. That is, as a result we get 2250 / 800 = 2.8 or 3 lamps.
2. Another method of calculation is more justified. The calculation is based on the number of lighting points installed in the room. For example: 2250/6 bulbs = 375 lumens. Such a flux is given by lamps with a power of 5 watts.

With the latter version of the room, an increase in the number of lamps of lower power leads to a more even distribution of light throughout the room.

More complex and accurate lighting calculation

In professional calculations, more than hard way calculations that apply to lamps of all kinds. General principles the calculations in both methods are the same, but for greater accuracy, additional coefficients are taken into account, such as:

• k is a safety factor that takes into account the dustiness of luminaires and the deterioration of their ability to transmit light, the decrease in the level of luminous flux from the lamp over time, the deterioration of the reflectivity of walls and ceilings. Since LED luminaires have a long service life without deterioration, the safety factor for them is 1.1.
• z - indicator of the ratio of average illumination to the minimum Eav / Emin, that is, the unevenness of the illumination level. For LED lamps, due to the even glow, this indicator is 1.
• Φ is the luminous flux of LED lamps, Lm, which is recognized on the packaging or from the accompanying documentation for lighting lamps.
• η is the utilization factor of the luminous flux, that is, the efficiency of the light source. In high-efficiency LED lamps, it is almost equal to 1.
• E - illumination rate in Lx, from tables or directly from SNiP.

Also, in a complex calculation, the corrective ceiling height is more accurately calculated. To calculate it, determine:

• h - the total height of the room
• h1 - the length or height of the suspension at the ceiling lamp
• h2 - height from the floor to the main work surface (table, bed)

Such a complex calculation is based on the fact that in most cases the light source is located below the ceiling, and highest level lighting is needed not at floor level, but at the height of the working surface.

The calculation formula is as follows:

hp = (h - (h1 + h2)), where hp is the estimated height of the room that needs lighting

This indicator, along with the length, width and with total area participates in the calculation of the room index, that is, the geometric characteristics of the room.

The room index (i) formula is calculated as follows:

i = S / (hp × (a + b)), where a and b are the length and width, and S is the area.

Eventually general formula for calculating the illumination of a room with LED lamps and determining required amount lamp looks like this:

N = (E × S × k × z × 100)/(n × F × η)

Such complex calculations are usually made during the design of the premises and the development of it. specifications. In everyday life, simpler methods are used.

Calculator calculation of lighting with LED lamps

In order to determine the number of LED lamps and their power for a particular room without hassle and difficulty, you can use the calculator "lighting calculation LED lamps". After the command to calculate software does everything on its own necessary calculations and will give you the results. With the received data, you can go to the store for lamps or place an order here on the site.

The calculator is under development, we hope for your understanding!

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