I will try to very briefly and simply set out the method of manual calculation of lighting in the rooms to which I was taught on the course "Calculation of lighting" School of LEDs LIDS.

What should be illumination
When planning lighting, first of all, it is necessary to determine the appropriate standards of target lighting and calculate the overall light stream, which should give lamps indoors.
With standards to determine simply or we are looking for your type of room in Sanpine tables 2.21 / 2.1.1 / 1278-03 "Hygienic requirements for natural, artificial and combined lighting of residential and public buildings" and SP 52.13330.2011 "Natural and artificial lighting", or We agree with the basic requirement for the illumination of residential premises - 150lk or office premises with computers - 400lk.

Rough estimate of the required light flux
By default, the illumination calculation is made in the Dialux program. But the result at least approximately need to know in advance to verify the data with the evaluation "on the eye".
As written even in Wikipedia, the average illumination of the surface is the ratio of the luminous flux falling on it. But in real premises, part of the light flux of the lamp of the work planes does not reach, disappearing on the walls. The illumination in the room is the ratio of the total light flow of the lamps to the room area with the correction coefficient "η".

The share of light "η", which comes to working surfaces, can be appreciated by eye. In the most general approximation for some very middle room with some lamps, approximately half of the light comes to working surfaces, which means that a very rough estimate can use a coefficient η \u003d 0.5.
For example, in a room with an area of \u200b\u200b20m 2, the lamp with a light flux 700lm (equivalent of incandescent lamps 60W) will create the illumination E \u003d 0.5 × 700lm / 20m 2 \u003d 18lk. And this means that in order to achieve a standard in 150lk, it is necessary f \u003d 700lm × (150lc / 18lk) \u003d 5800lm, or equivalent of 8 incandescent bulbs to 60W!
(Polkilovatta incandescent lamps on a small room! It is clear why the lighting standards for residential premises are much lower than for institutions, and why the institutions have long been not covered by incandescent lamps.)

More accurate method of manual calculation
But since the premises are with different walls, of different shapes, with high or low ceilingsA correction factor is not necessarily 0.5 and for each case its own: in practice, from 0.1 to 0.9. In the fact that the difference between η \u003d 0.3 and η \u003d 0.6 already means running out the results twice.
The exact value of η should be taken from the table of the utilization coefficient of the light stream developed in the USSR. In full, with explanations of the table, we bring in a separate document. Here we use the excerpt from the tables for the most popular case. For standard light room with reflection coefficients of the ceiling of walls and floor in 70%, 50%, 30%. And for the luminaires mounted on the ceiling, which will shine under themselves and a little sideline (that is, they have a standard, so-called, "cosine" curve of the forces of light).

Table. 1 The coefficients of using the light flux for ceiling lamps with a cosine chart in the room with the reflection coefficients, walls and floor - 70%, 50% and 30%, respectively.

In the left column of the table, the index index is indicated, which is considered by the formula:

where S is the area of \u200b\u200bthe room in m 2, a and b - the length and width of the room, H is the distance between the lamp and the horizontal surface on which we calculate the illumination.
If we are interested in the average illumination of the working surfaces (tables) in the room 20m 2 with walls 4m and 5m, and the height of the suspension of the lamp over the tables 2m, the indoor index will be equal to i \u003d 20m 2 / ((4m + 5m) × 2.0 m) \u003d 1.1. Making sure that the room and lamps correspond to the signature to the table, we obtain the utilization factor of the light flux - 46%. The multiplier η \u003d 0.46 is very close to the presidency η \u003d 0.5. The average illumination of working surfaces with a total light flow 700lm will be 16lk, and to achieve the target 150lk, it will take f \u003d 700lm × (150lc / 16lc) \u003d 6500lm.
But if the ceilings in the room were above half the meter, and the room was not "light", but the "standard" room with the reflection coefficients of the ceiling, walls and gender 50%, 30% and 10%, the utilization coefficient of the light flux η would be (cm . Extended version of the table) η \u003d 0.23, and the illumination would be smoothly twice as much!

Check the calculations in the Dialyux
We will construct a 4 × 5m room in the Dialyux, 2.8m height, with a height of working surfaces 0.8m and the same reflection coefficients as with a manual account. And hang 9pcs of small lamps with a classic cosine chart of 720lm each (6480lm on the circle).

Fig. 1 Taken for example Philips BWG201 lamp with light stream 720lm, and its classic "cosine" light distribution

Will we get the average lighting of working surfaces in 150lk, how did we appreciate manually? Yes, the result of the calculation in the Dialux - 143lk (see Riga2), and in an empty room without furniture and human figure - 149lk. In the lighting of the same values \u200b\u200bthat differ in less than 10% are considered coinciding.

Fig. 2 The result of the calculation in the dialyux - the average illumination of the working surface (with the reserve coefficient 1.0) was 143lk, which corresponds to the target value of 150lk.

Fig. 3 Beautiful pictures that believe people.

Conclusion:
For a rough estimate, the primitive method according to the formula E \u003d 0.5 × F / S will require 1 minute of time, to clarify the utilization ratio of tables - another 3 minutes, the project in the Dialyux after some training is about 20 minutes and another 20 minutes, if you want to "bring Beauty. " Dialyux issues very beautiful pictures (See Fig. 3) who have a spent labor, because people believe in them. But according to the ratio of efficiency and labor costs, evaluating the lighting of paint-out competing. The manual account is simple, reliable and effective as a spermnaya blade, gives confidence and understanding.

The calculation of the illumination of the room, shown in this article, is based on a simplified method of approximate calculation. This method uses designers and architects when determining the necessary illumination in nonspecific cases. It gives indicative information and they can be guided by ordinary buyers when evaluating the necessary lighting device.

The calculation of the illumination of the room by this method is made based on the tables below. It is necessary to take into account that the tables contain the magnitude of the illumination as a whole for the entire premises. In some cases, it is required to calculate special local lighting (office, kitchen work area).

The table shows the generally accepted lighting norms when the ceiling height of the room no more than 3 m.

The specified power in watts (W) refer to the power consumption of a conventional incandescent lamp, for other types of lamps, correction coefficients are listed in the second table.

To evaluate the required amount of lamps, you have enough area of \u200b\u200bthe illuminated room (m²) multiply by the amount of W in the table row.

With the height of the ceilings more than 3 meters, the amount of calculated power of consumption must be multiplied by 1.5 (minimum).

Evaluate Lamp Watt Lamp not entirely correctIn this table, this value is indicated due to its widespread.

Do you know what is the sources that should be taken into account in the calculation of light? You can learn about them all from our article.

You can also familiarize yourself with the premises of various types. Try to figure out what rules are defined for the premises in which you live?

Matching light from type of lamp

Light the working office in 30 m² with a ceiling height of 2.6 meters. The overall illumination is found in the first table and accept as 17 W / m². Thus, we need incandescent lamps with a total power consumption of 510 W.

That is, approximately the lamp or lamps on 5 lamps with a capacity of 100 W each.

In the event that it is not incandescent lamps - correct the calculation. For this you can go in two ways:

1. The total power consumption is divided by 1.5 and get 340 W. For example, it can be 7 halogen lamps of 50 W.
2. This option is more applicable when you are tied to the number of lamps. For 510 W, 8 incandescent lamps are suitable, given the correction coefficient, you can take 8 halogen lamps of 40 W or 8 energy-saving 11 W.

Thus, in the room you can install one chandelier on 5 horns, one wall with two lamps and one floor lamp.

Do you know that you can adjust the illumination of residential premises by installing. Read about it in our article.

Please note that we also have an overview of the use when lighting the premises.

For more accurate calculation, the color of the decoration finishes should be taken into account.

When the furniture and walls of the rooms of dark tones with the matte character of the surface, the amount of incoming light should be taken into account with a margin.

More details are presented in the table below.

Room	Medium light	Direct lighting				Mixed lighting				Indirect lighting
		Finishing of the room
		light		dark		light		dark		light		dark
		BUT	B.	BUT	B.	BUT	B.	BUT	B.	BUT	B.	BUT	B.
For incandescent bulbs
Parishion	60	10	16	12	20	11	20	14	24	12	24	10	32
Cabinet	250	42	70	50	83	42	83	60	100	50	100	70	140
Bedroom	120	20	32	24	40	20	40	28	40	20	48	32	64
Bathroom, kitchen	250	42	70	50	83	42	83	60	100	50	100	70	140
Square, pantry	60	10	16	12	20	11	20	14	24	12	24	16	32
Basement, attic	60	10	16	12	20	11	90	14	24	12	24	16	32
For luminescent lamps
Hall, staircase	60	3	5	4	6	3.5	6	4.5	7.5	4	7.5	5	10
Bathroom, kitchen	250	13	21	17	25	15	25	19	31	17	31	21	42
Square, pantry, basement, attic	60	3	5	4	6	3.5	6	4.5	7.5	4	7.5	5	10

It should be remembered that different lamps and lamps due to their designs can give various light streams, intensity, brightness. The main lighting is not always able to evenly illuminate the entire room, that is, individual parts of the room may turn out to be more "dark".
To achieve more uniform lighting use additional light sources in the form of flooring, brake, etc.

For basic lighting, it is better to use chandeliers and ceiling lamps that have plafones from matte or opal glass. Light passing through such a surface will be more scattered, i.e. Soft. Such a source of light can more evenly illuminate the entire space of the room.

For a more accurate calculation of the placement of the room should be used Slug (building regulations).

I will try to very briefly and simply set out the method of manual calculation of lighting in the rooms to which I was taught on the course "Calculation of lighting" School of LEDs LIDS.

What should be illumination
When planning lighting, first of all, it is necessary to determine the appropriate standards of target lighting and calculate the overall light stream, which should give lamps indoors.
With standards to determine simply or we are looking for your type of room in Sanpine tables 2.21 / 2.1.1 / 1278-03 "Hygienic requirements for natural, artificial and combined lighting of residential and public buildings" and SP 52.13330.2011 "Natural and artificial lighting", or We agree with the basic requirement for the illumination of residential premises - 150lk or office premises with computers - 400lk.

Rough estimate of the required light flux
By default, the illumination calculation is made in the Dialux program. But the result at least approximately need to know in advance to verify the data with the evaluation "on the eye".
As written even in Wikipedia, the average illumination of the surface is the ratio of the luminous flux falling on it. But in real premises, part of the light flux of the lamp of the work planes does not reach, disappearing on the walls. The illumination in the room is the ratio of the total light flow of the lamps to the room area with the correction coefficient "η".

The share of light "η", which comes to working surfaces, can be appreciated by eye. In the most general approximation for some very middle room with some lamps, approximately half of the light comes to working surfaces, which means that a very rough estimate can use a coefficient η \u003d 0.5.
For example, in a room with an area of \u200b\u200b20m 2, the lamp with a light flux 700lm (equivalent of incandescent lamps 60W) will create the illumination E \u003d 0.5 × 700lm / 20m 2 \u003d 18lk. And this means that in order to achieve a standard in 150lk, it is necessary f \u003d 700lm × (150lc / 18lk) \u003d 5800lm, or equivalent of 8 incandescent bulbs to 60W!
(Polkilovatta incandescent lamps on a small room! It is clear why the lighting standards for residential premises are much lower than for institutions, and why the institutions have long been not covered by incandescent lamps.)

More accurate method of manual calculation
But since the premises are with different walls, different shapes, with high or low ceilings, the correction factor is not necessarily 0.5 and for each case, in practice, from 0.1 to 0.9. In the fact that the difference between η \u003d 0.3 and η \u003d 0.6 already means running out the results twice.
The exact value of η should be taken from the table of the utilization coefficient of the light stream developed in the USSR. In full, with explanations of the table, we bring in a separate document. Here we use the excerpt from the tables for the most popular case. For standard light room with reflection coefficients of the ceiling of walls and floor in 70%, 50%, 30%. And for the luminaires mounted on the ceiling, which will shine under themselves and a little sideline (that is, they have a standard, so-called, "cosine" curve of the forces of light).

Table. 1 The coefficients of using the light flux for ceiling lamps with a cosine chart in the room with the reflection coefficients, walls and floor - 70%, 50% and 30%, respectively.

In the left column of the table, the index index is indicated, which is considered by the formula:

where S is the area of \u200b\u200bthe room in m 2, a and b - the length and width of the room, H is the distance between the lamp and the horizontal surface on which we calculate the illumination.
If we are interested in the average illumination of the working surfaces (tables) in the room 20m 2 with walls 4m and 5m, and the height of the suspension of the lamp over the tables 2m, the indoor index will be equal to i \u003d 20m 2 / ((4m + 5m) × 2.0 m) \u003d 1.1. Making sure that the room and lamps correspond to the signature to the table, we obtain the utilization factor of the light flux - 46%. The multiplier η \u003d 0.46 is very close to the presidency η \u003d 0.5. The average illumination of working surfaces with a total light flow 700lm will be 16lk, and to achieve the target 150lk, it will take f \u003d 700lm × (150lc / 16lc) \u003d 6500lm.
But if the ceilings in the room were above half the meter, and the room was not "light", but the "standard" room with the reflection coefficients of the ceiling, walls and gender 50%, 30% and 10%, the utilization coefficient of the light flux η would be (cm . Extended version of the table) η \u003d 0.23, and the illumination would be smoothly twice as much!

Check the calculations in the Dialyux
We will construct a 4 × 5m room in the Dialyux, 2.8m height, with a height of working surfaces 0.8m and the same reflection coefficients as with a manual account. And hang 9pcs of small lamps with a classic cosine chart of 720lm each (6480lm on the circle).

Fig. 1 Taken for example Philips BWG201 lamp with light stream 720lm, and its classic "cosine" light distribution

Will we get the average lighting of working surfaces in 150lk, how did we appreciate manually? Yes, the result of the calculation in the Dialux - 143lk (see Riga2), and in an empty room without furniture and human figure - 149lk. In the lighting of the same values \u200b\u200bthat differ in less than 10% are considered coinciding.

Fig. 2 The result of the calculation in the dialyux - the average illumination of the working surface (with the reserve coefficient 1.0) was 143lk, which corresponds to the target value of 150lk.

Fig. 3 Beautiful pictures that believe people.

Conclusion:
For a rough estimate, the primitive method according to the formula E \u003d 0.5 × F / S will require 1 minute of time, to clarify the utilization ratio of tables - another 3 minutes, the project in the Dialyux after some training is about 20 minutes and another 20 minutes, if you want to "bring Beauty. " Dialyux issues very beautiful pictures (see Fig. 3), which are spent the work spent, because people believe in them. But according to the ratio of efficiency and labor costs, evaluating the lighting of paint-out competing. The manual account is simple, reliable and effective as a spermnaya blade, gives confidence and understanding.

So that in the room it was comfortable at any time of the day, it is important to achieve not only high-quality natural, but also artificial lighting. Compare with the quality of natural light is difficult, but still you can try. To do this, you need to know how to calculate the light stream.

Why calculate the illumination?

Regardless of which lamp and the lamp in it is used, the calculation of the lighting is recommended separately for each room, taking into account the lamps used, lamps, colors and type of decoration. Only by correctly placing the lighting devices in the desired quantity, it will be possible to achieve a harmonious effect. This is necessary for:

1. Comfortable location and livelihoods.
2. Works of the auditorium of a person depending on the tasks performed by it.
3. Exceptions to reduce visual acuity.

In the process of assessment into account take:

• Illumination, measurement is made in lumens. This parameter is considered the most important, because it affects the value of the light flux, which is distributed around the room.
• Brightness, main meter - suites.
• The power of light in Kandela.

Opinion expert

Alexey Bartosh

Specialist in repair, maintenance of electrical equipment and industrial electronics.

Ask a question expert

Important! The optimal illumination parameter is important for human health. The disadvantage or oversupply of light has an impact not only for visual acuity, but also for a psychological state. As a result, impassable, disorder and general deterioration of the state.

The difference of natural artificial lighting

The best lighting for human eye is natural, that is, daytime, morning, evening, including what comes from the sun behind the clouds. Light from lamps - artificial, it is formed as the result of transformation into electromagnetic radiation of electrical energy. The key task of calculating the room lighting is an approximation of artificial light (regardless of the type of lamps used) to the natural one.

Methods of calculation

Calculate the required and sufficient light flux will be able to be one of three methods:

1. Specific power. Used to estimate overall lighting. For complete power, multiply regulatory data (specific power) to the room area is required. In order to correctly determine the regulatory indicator, it is necessary to consider: type of lamps, the purpose of the room, the distribution of lamps on the wall and ceiling. At the same time, after calculations, a convenient and comfortable configuration and light conditions for humans are determined.
2. Application ratio. To begin with, the location of light sources with a light-up to the configuration of the room and the ability to reflect or absorb light. According to the formula, it is envisaged to multiply the lighting standard on the room area on the reserve coefficient and the MIN light coefficient. All this is divided into multi-dimensions multiplied together and.
3. Point. This method is considered suitable for any room, it can be used, for the miscalculation of light sources on the street. To obtain results, an assessment of illumination is carried out at individual points that light falls. In this case, the lighting devices can be placed as you like. The assessment is carried out in key points for the user. Especially relevant such technique in the rooms, where on the walls dark finish and complex ceiling configuration.

These methods in the implementation are not very complex, but still there is a method much easier, it is presented below.

The choice of the calculation method depends on the type of lamps used

Simple method of calculation

The proposed calculation option is more suitable for the placement of the correct shape - square or rectangular. The illumination is measured in suites (LC), the miscalculation of the parameter of the light stream will consist of two stages:

1. Calculation of a solid light flux that is required to illuminate a room with a certain quadrature.
2. Determining the number of light sources.

In the first step, we calculate the required parameter of the light flux for the room. The miscalculation is made by the formula:

SVP \u003d x * y * z, where

X - Regulatory illumination for room. You can find these standards in the list below.

Y - Room Square in m².

Z - correction coefficient taking into account the height of the ceilings. So, for ceilings with a height of up to 2.7 m, this parameter \u003d 1, for 2.7-3 - indicator 1.2, for rooms with a ceiling of 3-3,5m - 1.5, for the room over 3.5 - coefficient 2 .

Regulations for premises in the house:

1. Corridor, hallway - 50-75 LC.
2. Pantry - 50 LC.
3. Kitchen - 150 Luke.
4. Any residential room - 150 LCs.
5. Children's - 200 LC.
6. Bathroom - 50 LC.
7. Cabinet or library - 300 LC.
8. Staircase - 20 lk.
9. Sauna, swimming pool - 100 Luke.

How much lights need depends on the purpose of the room

The second stage will help determine the number of light sources, in this case we take lED bulbs. Approximate indicators for which you can navigate:

Examples

Initial data:

1. Children's room with an area of \u200b\u200b25 square meters. m.
2. Ceiling height - 3 m.
3. It is planned to use lamps of 8 W.

First stage:

200 (x) * 25 (y) * 1,2 (z) \u003d 6000 lm

Lamps that will be used 10 W, their light stream, declared by the manufacturer of 900 lm. That is, the required amount is 6000/900 \u003d 6.66. Rounding gives the number of 7 lamps.

If you use light-power lighting lamps, for example, 4 watts place them around the perimeter of the room on the walls, then 13 light bulbs will be required. In this case, the distribution of light will be more uniform. It also should also take into account the type of lamp used, its design and interior solution.

Quality of lighting for children is especially important

Similar calculations will be able to carry out for both incandescent and luminescent lamps, table will help in the calculations:

Calculate for the same room. Incandescent lamps need:

1. 60 W - 6000/700 \u003d 8.57, rounded - 9 pcs.
2. 75 W - 6000/900 \u003d 6.66, rounded - 7 pcs.
3. 100 W - 6000/1200 \u003d 5 pcs.

Fluorescent lamps:

• 10-12 W - 6000/400 \u003d 15 pcs.
• 15-16 W - 6000/700 \u003d 8.57, rounded 9 pcs.
• 18-20 W - 6000/900 \u003d 6.66, rounded 7 pcs.

These calculations are given by relying on the norms of still Soviet SNIPs, so experts recommend multiplying the result of the ratio of 1.5-2, depending on the premises and interior decisions.

Tip! To not count with your own hands, you can use special devices, such as Cromatest. This device helps measure the intensity of light. Another device is a luxmeter, the main component of which selenium photocell. You can also contact specialized companies that will assist in the calculation for a certain remuneration.

The difference between the color temperatures of the lamp

What should be considered when calculating?

Before spending any calculations, it should be determined which lamp will be used. At the moment available options LAMM:

1. Incandescent.
2. Halogenic.
3. Luminescent: compact or linear.
4. LED: lamps, ribbons or spotlights. In the case of S. lED ribbon The density of the placement of LEDs is important. You can find out this parameter, considering the tape carefully.

The type of lighting device is also influenced, primarily on the dispersion of light, the place of use. Any of these light sources is characterized by such parameters that the light stream can be measured. Specifically:

• Power. This is the amount of energy that consumes the lamp, the unit of measurement W.
• Light flow. As already mentioned this amount of light that emits.
• The heating of the housing is used for incandescent and halogen lamps.
• Color reproduction. This parameter includes: colorful temperature and shade. The first point is from red to blue (1800-16000 Kelvin). Tint for modern lamps warm or cold. It is he who asks the general perception of illumination.

Color reproduction different types LAMM:

1. Incandescent lamp - from 2200 to 3000 Kelvinov (K).
2. Halogen - 3000 K.
3. Fluorescent lamp (warm light) - 3000k.
4. Luminescent lamp (white light) - 3500 K.
5. Day fluorescent lamp - 5600-7000K.

Important! The smaller the color temperature, the closer to the red, the more, the closer to the blue.

Two more important parameters: Light flow and light return. The first is the amount of light that the lamp emits, the second is the ratio of the light stream to the power - LM / W, that is, how effective it is economical.

Formula for calculating light flux

When selecting a lamp and calculations, it is important to consider such factors:

• The location of the lamp. Options - ceiling or wall.
• Installation height in case of wall mounting.
• Transparency of plafones and availability decorative elements on them.
• Light direction: up, down, to the side.
• The color of the walls, furniture: light reflect light, dark absorb.

Inaccuracies and errors: what they are connected with

Difficulties arise when during the planned repair is replaced by some lamps onto the other, the change of lamps, the ceiling and walls are mounted new finish. All this affects the calculations. The main problem is not taken into account the reflection coefficient of surfaces. The reduction of the light stream affects:

1. Dark wallpaper.
2. Laminate, linoleum shade is darker than it was before.
3. Suspended or stretch ceiling, its type and reflective ability.

All these moments relate to general lighting, as locally, for example, in work zone Behind the writing light is enough. This is understandable, because in such sites, individual lighting devices are most often mounted.

In order not to be mistaken, it should be borne in mind what kind of reflection coefficient has each color. Thus, white surfaces reflect 70%, other light by 50%, gray - 30%, black - 0%.

Often, when calculating the reference point takes a slope, but do not forget that they have been developed in Soviet times. To begin with, at that moment there were no modern light sources, the second point - there was no particular concern for the comfort of stay in the room and the condition of the eyes.

Remember, if there are a lot of lamps, then you can reduce their number, especially if you mount your switch for each lighting group.

Output

Calculate the light stream is easy, but it is important to take into account many moments: the type of lamp, the color of the ceiling, walls, floor, even the shade of furniture. It is important to remember that it is better than the light sources that can be controlled than saving.

The entire calculation is 2 minutes, 2 steps. All quickly and easy!

Dear readers, in this article we will not give detailed complex methods for calculating the illumination of rooms, we will not force you carefully pepper into the slopes and tables in search of the desired coefficients. We will tell us as approximately using a simplified quick technique, calculate the necessary illumination of the room (rooms), as well as how to calculate the number of lamps needed for comfortable lighting.

First, we need to know that the illumination is measured in suites (LC), and the magnitude of the light flux is in lumens (LM). Again, this method of calculating the illumination allows us to not understand the relationships and intricateings of these quantities. We approach this just - we need to know this in order to choose the right lamps and the number of lamps for the room (room).

Stages of calculation:

1. Calculation of the required light flux on the room (the number of lm to the entire room).
2. Calculation of the required number of lamps on the room (room).

1. Calculation of the required light flux on the room (room).

Formula for calculating the luminous flux in lumens (LM):
Luminous stream (lumen) \u003d a * b * in;

Where:
BUT - the regulatory value of the illumination of the room (room) is presented below in the table;
B. - area of \u200b\u200bthe room (rooms) in M.KV;
IN - the ceiling height coefficient (up to 2.7 m - 1.0; 2.7-3.0 m - 1.2; 3.0-3.5 m - 1.5; 3.5-4.0 - 2 0);

2. Calculation of the required number of lamps per room (room).

So, we defined the required amount of light flux (the number of lumens). Now we can calculate the required number of lamps on the room (room). Below is a table in which you can choose the number of lamps for the room (room) and compare the main popular types of lamps according to their light flow characteristics and power ratio.

All these calculations are approximate and suitable for selection chandelier or lamp located in the center of the room.

If you want to understand how much you need point lamps With LED light bulbs, it is better to proceed at the rate of one lamp with a capacity of 5-7 W (450-550 lm) per 1.2-1.5 sq.m

Table No. 1: Regulatory Lights Lights / Rooms, according to SNiP:

Types of office space	Light norm According to SNiP, LK	Types of residential premises	Light norm According to SNiP, LK
General purpose office using computers	300	Living room, kitchen	150
Office in which drawing work is carried out	500	Children's room	200
Room for conferences, meeting room	200	Bathroom, Bathroom, Shower, Apartment Corridors and Hall	50
Eccalator, staircase	50-100	Wardrobe	75
Hall, corridor	50-75	Cabinet, library	300
Archive	75	Stairs	20
Storage rooms, pantry	50	Sauna, swimming pool

Table # 2: Averaged light bulbing light bulbs (lumen number).

Types of bulbs Light Bulb Type)			CFL	Led.
Minimum glow (Lumens)	450lm	40w.	9W To 13W.	4W to 5w.
	680lm	60w.	13W To 15W.	6W To 7W.
	1100lm	75W	18W to 25w	9W To 13W.
	1600lm.	100w	23W to 30w	16W to 20w.
	2600lm.	150w.	30W to 55w	25W To 28W.

The data presented in the table is approximate, depending on the manufacturer, they may differ.

A few small tips on the calculation of the light stream and the choice of the number of lamps:

1. Remember that the Snaps were developed in Soviet times. At the time about the health of citizens (meaning in mind), they did not really care, not to mention the comfort of finding indoors or work in it. So it will not be superfluous to add a small stock ratio into the calculation of your illumination (light flux).
2. If you have more lamps in your room than you need - you can always turn off some of them. And what will you do if the light is missing, and how will it look like?
3. Remember that the surfaces have a property to reflect light. The smaller the surface is the more light it reflects, the darker - the less the light is fighting off from it. The light that is reflected from the surface is also light, i.e. Reflected light also illuminates the room. If dark tones dominate in your room or room - it is worth increasing the value of the luminous flux during the selection of lamps, since the dark surfaces of the room are injured a large number of Sveta.

Table # 3: The reflection coefficient of light.

room Height	S floor m 2	place color
		light.	average.	dark
<3м	up to 20.	0,75	0,65	0,60
	up to 50	0,90	0,80	0,75
	up to 100.	1,00	0,90	0,85
3-5m	up to 20.	0,55	0,45	0,40
	up to 50	0,75	0,65	0,60
	up to 100.	0,90	0,80	0,75
5-7m	up to 50	0,55	0,45	0,40
	up to 100.	0,75	0,65	0,60

If you need to calculate the illumination and the number of lamps for non-standard premises (with very high ceilings or intricate shape), or you need to pick up high-quality lighting for room, house or office, call us and our specialists will provide comprehensive information and offer a solution.