How many lumens and what is the luminous flux in the lamp? Difference between brightness and illuminance.

It can be difficult even for an experienced consumer to understand the technical features and numerous characteristics.

The following questions are common regarding LED lamps:

• What is the equivalent of a 100-watt incandescent lamp?
• How is the luminous flux of a lamp determined?
• How many lumens are in a light bulb?
• How to choose an LED analogue to incandescent lamps?
• How many lumens are contained in 1 W of an LED light bulb?

Check out the table for the ratio of lumens (Lm) to watts (W) for an incandescent lamp in relation to an LED lamp:

How many lumens are in 1 W LED bulb?

In LEDs, the luminous flux varies depending on the manufacturer, quality and voltage. Average values ​​for 1 W are 80-150 lm. If you increase the voltage of the LED, the luminous flux will also increase, but this also entails an increase in the emitted temperature. To reduce the temperature, various cooling methods are used using radiators and cooling systems.

What is a lumen?

Lumens measure the luminous flux of a light source.

How to determine the number of lumens in a light bulb?

First, you need to study the product box or product specification for the specified luminous flux. If the information is not provided, you can find a similar product from a well-known manufacturer to compare the characteristics.

It is also possible to determine how many lumens are in your light bulb yourself using a lux meter. Lux denotes the ratio of the number of lumens to the illuminated area (1 Lx = 1 Lm\sq.m). You need to know the illumination declared by the manufacturer for a specific LED lamp.

In practice, the illumination indicator on the working surface, measured in lux, is of primary importance. The correspondence of illumination of working surfaces and premises for different fields of activity is determined by state standards prescribed in SNiP 05/23/2010.

How many lumens are there in LEDs relative to other light sources?

• LN - incandescent lamp,
• GLN - halogen lamp,
• LL - fluorescent lamp,
• CFL - compact fluorescent lamp,
• MGL - metal halide lamp.
• DRL - mercury arc lamp. High-pressure gas-discharge mercury lamps. Used for general lighting of industrial premises and open spaces.

Lamp type	Power, W	Length, mm	Diameter, mm	Base type	Light flow
DRL 125	125	178	76	E-27	≅ 5500
DRL 250	250	228	91	E-40	≅ 12000
DRL 400	400	292	122	E-40	≅ 20000
DRL 700	700	357	152	E-40	≅ 40000
DRL 1000	1000	411	167	E-40	≅ 55000

Light output can be reduced by up to 40 percent due to re-reflection losses, depending on the lamp body and the shape of the diffuser when using DRL in lamps.

The reign of incandescent lamps in our homes has already come to an end. Diode and induction began their victorious march. Now it’s not just a spiral that heats up and shines. A modern LED is a complex electronic lighting device with a power supply based on microcircuits and high-tech crystals. Some models are equipped with remote control systems, motion and lighting sensors.

In Soviet times, the indicator of brightness was the power of the light bulb. Now this indicator is fading into the background; now this value only approximately characterizes the luminous flux of LED lamps.

• 1. How is luminous flux measured?
• 2. Types of deception
• 3. Matching LED and incandescent
• 4. Compliance
• 5. Fluorescent CFLs
• 6. Large fluorescent light bulbs
• 7. Halogen
• 8. Brightness adjustment
• 9. DRL and DNAT
• 10. Luminous flux of LED lamps
• 11. Color temperature
• 12. How to calculate light flux
• 13. Results

How is luminous flux measured?

The unit of measurement of luminous flux, abbreviated as “lm”. This parameter characterizes the most important indicator of modern lighting technology, the amount of light from the source. The second important indicator is the number of Lumens per 1 Watt.

Efficiency example:

1. LEDs have from 60 to 200 lm/W,
2. energy saving 60 lm/W;
3. diode spotlights are usually 80-110 lm/W.

The unit of luminous flux does not depend on the color temperature of the source and the method of obtaining light. This could be an ice crystal, a filament, or a gas-discharge arc.

Types of deception

Unscrupulous manufacturers actively take advantage of ignorance of the correspondence between lumens and energy consumption. For example, they indicate in the characteristics:

1. power 7W;
2. light output 500lm;
3. analogue of a 70W incandescent lamp.

An elderly buyer focuses only on the last point, where an analogue is indicated. The light output of a similar 70W should be 700-800lm, not 500lm. After the purchase, it turns out that the new light bulb shines worse, so you need to buy new ones if you bought a chandelier kit right away.

It’s good if the manufacturer did not deceive and indicated the light flux honestly. Manufacturers of the cheapest lighting equipment overestimate the parameters of their lamps, light bulbs and spotlights. According to the results of my testing, real power and light flux are lower by up to 30-40%.

Compliance of LED and incandescent

Average values ​​are given as a guide and may vary by approximately +/- 15%. Depends on the type of matte light diffuser, design and components. Most often they ask about the luminous flux of an incandescent lamp of 100 watts and 60 watts.

Luminous flux of LED lamps table

The efficiency of LED lamps is from 70 to 110 lm/W, but the matte polycarbonate bulb has a strong effect. Depending on the quality, it loses from 10% to 30% of light.

For incandescent heating, the mains voltage of 220 volts plays an important role. Changing the voltage from 220V to 230V adds 10% to the brightness.

But it should be borne in mind that with a regular incandescent light the light spreads over 360 degrees, with a diode - about 180 degrees. When installing in a chandelier or lamp, the light transmittance of the installed shades should be taken into account. The situation with a diode light source can be improved by the shape of the lampshade if its hole is located opposite the bulb. In this position, less light will be lost inside and more light will come out.

Correspondence

..

The Chinese made a significant contribution to the confusion in terms of power and light flux. In Soviet times, lighting technology met state standards. Hardworking Chinese began to produce lighting equipment according to their own standards and import them to Russia. Now a standard 60W light bulb, depending on the manufacturer, can range from 500lm to 700lm. According to domestic standards, this parameter was from 600 to 650 lm.

I came across these Chinese ones and bought 15 of the simplest and most inexpensive ones. It seemed ordinary, I couldn’t even imagine how it could be done badly. Within 1 month, everything was out of order, everyone’s glass bulb fell off, one even hit me in the head, it’s good that it didn’t break.

Fluorescent CFLs

The most common type of fluorescent in your home is in the form of CFLs, Compact Fluorescent Lamps. In stores and at home they are called “energy-saving CFLs.” Compactness is achieved by twisting the luminous tube into a spiral.

They are also actively replacing fluorescent and energy-saving lamps with LED ones. This applies to the classic and tube shapes. At the same time, Armstrong ceiling lamps require minor modification to remove electronic ballasts.

Luminous flux of fluorescent lamps table

Incandescent	CFL	Light flux, Lm
25 W	5W	250
40 W	9W	400
60 W	13W	650
80 W	15W	900
100 W	20W	1300
150 W	35W	2100

Types of CFLs

Correspondence table for CFLs

Thanks to the Chinese and the economic situation that has developed due to the dollar exchange rate, manufacturers like to overestimate the light flux parameters. This overstatement allows you to stand out from others and increase sales. Measuring light output is difficult and requires expensive equipment, so the average buyer will not detect this deception.

The luminous flux of a fluorescent lamp depends on its shape; the dense spiral of a CFL obscures some of the light and it remains inside the spiral. There is more light from simple tubes that do not have complex shapes.

Large fluorescent light bulbs

Large ones include fluorescent tubes 47cm and 120cm long from ceiling and wall lamps. They are designated T5 and T8, their base is G13, G23. The most popular are 18 W and 36 W

When replacing with LED tubes, keep in mind that they may have a matte diffuser. The manufacturer can easily indicate the light flux without this diffuser, on which 10-20% is lost. The number of phosphor layers on the walls also affects the color temperature.

Table for simple

Luminescent	LED analogue, Watt	Lumens
10 W	5	400
15 W	8	700
16 W	9	800
18 W	11	900
23 W	15	1350
30 W	20	1800
36 W	23	2150
38 W	25	2300
58W	35	3350

In addition to inexpensive budget models, expensive, improved ones are also produced. The price differs significantly, but it pays off with increased light output, which is 50% more. The light output of improved 58W models is the same as that of LEDs, 90 lm/W. The disadvantage is the high reactive energy consumption, which depends on the power factor indicator.

Table for improved

Luminescent	LED analogue, Watt	Lumens
10 W	7	650
15 W	10	950
16 W	14	1250
18 W	15	1350
23 W	20	1900
30 W	25	2400
36 W	35	3350
38 W	35	3300
58 W	55	5200
Information obtained from the official Osram website for the Standard series

The typical service life is 15-20 thousand hours, but there are models with a service life of 75,000 - 90,000 hours, for example from the Osram LUMILUX XXT T8 series.

Another significant disadvantage is the reduction in luminous flux at low temperatures. The pressure in the tube decreases and the light output decreases.

For Armstrong ceiling lights, energy consumption and luminous flux are usually indicated, for example 36W and 2800lm. The manufacturer is silent that 2800lm is the light flux of lamps without the lamp itself. After all, in it one side of the tube shines into the body, the other into the room. To prevent light from being lost on the wall, a reflector is installed. But it is located close to the tube, so the tube body obscures 15 to 20% of the reflected light. Therefore, the actual number of lumens for the Armstrong lamp is lower; instead of 2800lm there will be only 2200lm.

T5 T8 LED tubes do not have this problem and no reflector is required. LEDs are installed on one side and shine only towards the room.

Halogen

In miniature lighting sources, such as spotlights for the ceiling, halogen lamps were installed. The halogen lamp has minimal dimensions compared to others. Most often this is the G9 base, which is the one with the most problems now. The brightness of the diodes depends on the size of the cooling system. To make an LED the size of a halogen, the cooling has to be very small. Therefore, the power of diodes with a G9 base does not exceed 300lm. The specifications often overestimate, indicating 400-600lm, also do not believe the parameters on the Aliexpress market. When using a chandelier with 6 cartridges and 300 lumens per LED, it is impossible to obtain good lighting; you will have to change the chandelier.

Correspondence table for simple halogen

Halogen	LED analogue	Lumens
5 W	2	60
10 W	3	140
25 W	4	260
35 W	5	410
40 W	6	490
50 W	9	700
Data from Osram website

Conversion table for improved halogen lamps

Halogen	LED analogue	Lumens
10 W	3	180
20 W	4	350
25 W	6	500
30 W	5	650
35 W	8	860
40 W	12	980
50 W	14	1200
Values ​​used from the official Osram website for Standard series halogen lamps with G4 and G9 sockets

The average service life is from 1000 hours to 2000 hours. The higher the power, the shorter the service life.

Brightness adjustment

A device for regulating the power of the light flux is called a dimmer. Only incandescent, halogen and some LED lamps are compatible with it. For diode sources, a special dimmer must be installed, which differs in minimum power, for a regular one from 30W, for an LED dimmer from 1W. This is due to the low power consumption of LEDs.

Fluorescent and others with ignition units do not support regulation. They require constant voltage to operate.

DRL and DNAT

In industrial and street lighting, DRL and DNAT lamps are used, which have decent light output. With such high power consumption, the E40, E40 base is used.

• DNAT is sodium arc tubular;
• DRL is a mercury arc fluorescent.

Their lm/watt efficiency is at the level of simple LEDs, but their service life is 3-4 times lower. In addition, light output decreases faster than with LED lighting.

Table of analogues for sodium

Table of analogues for mercury

Modern LED analogues of lamps with good diodes, for example Osram Duris, have a service life of about 100,000 hours. The power supply will fail faster than the LED chips. A good power supply (driver, converter) with Japanese components lasts up to 70,000 hours. Much depends on the capacitors, which lose their capacity and the power parameters of the LEDs change.

Luminous flux of LED lamps

Most modern street and industrial lamps are now produced using high-quality LEDs, such as NationStar, Osram Duris, Cree, LG, Samsung. Their light output is 110 -120 lm/watt.

Industrial, outdoor, production

Household floodlights for home

For household spotlights, LED diodes are installed that are simpler, their operating conditions are easier and they are much easier to replace. The Chinese, as always, save money and can install low-quality LEDs. I came across lamps for apartments and other residential premises with an efficiency of 60 lm. per watt, instead of the usual 80-90 lm/w. According to measurements, it turned out that it consumes a decent amount of energy, but does not produce light. At first I thought the equipment was broken, but after calibration nothing changed, the lighting was bad.

Colorful temperature

Most of us are accustomed to the warm light of incandescent sources; they don’t want to switch to neutral white. As practice shows, it’s worth trying neutral white light for two days, and then no one agrees to switch back to warm.

In the photo you see clear examples of the difference in color temperature:

1. warm 2700K, 2900K;
2. neutral white 4000K;
3. slightly coldish 5500K and 6000K.

How to calculate light flux

To find out how many lumens a source has, use average light output values:

1. for diodes, multiply the power by 80-90 lm/W for light bulbs with a frosted bulb and get the light output;
2. for diode filament multiply the energy consumption by 100 lm/W, transparent filament with diodes in the form of yellow stripes;
3. multiply fluorescent CFLs by 60 lm/W, for expensive ones it can be higher, but they lose brightness much faster, so this value will be more accurate;
4. DNAT 66 lm/W for 70W, 74 lm/W for 100W 150W 250W, 88 lm/W for 400W;
5. The DRL multiplier will be 58 lm/W with an average service life of 12 to 18 hours, Chinese ones may have other characteristics, they always manage to save money even where this is practically impossible.

Results

As you can see from the tables above, there are simple and improved models of light bulbs. Before replacing them with new ones, find out the exact model of the old ones; usually the markings are on the body. Based on the marking, look online for the manufacturer’s website, which should contain information about the technical characteristics. If this is not done, the new lighting may turn out to be worse than the old one.

Another option is to take a sample with you to the store and show the seller, some of them are good at this. In the case of an online store, send the photo to the consultant by email.

Ten years ago, choosing the right light bulb was easier, because incandescent lamps were labeled with maximum power. Currently, new LED lamps are becoming increasingly popular. Choosing a product with the right wattage in the modern lighting era is more difficult, because LED lamps, compact fluorescent lamps and other energy-saving lamps have completely changed wattage values. Now focusing on watts will not be entirely correct, and it is not always possible. If in a regular store a specialist can still help you choose the right light bulb, then when making a purchase online, you are unlikely to find the watt in the description of this light bulb.

What is luminous flux?

Watts refers to the amount of energy consumed. For example, a 100-watt light bulb uses more energy than a 60-watt light bulb. This value shows how much energy will be spent - it does not in any way indicate the number of light rays that the lamp produces. 1 lumen shows how much light you get from a light bulb.

Lumen is a unit of measurement luminous flux in the calculation system. The brighter the light bulb, the greater this value will be. For example, a regular 40 W incandescent lamp has a luminous flux of 300 lumens. Converting lumens to watts is not as easy as it seems.

The packaging of each product must contain information about how much light the product produces. When electrical energy is converted into light rays, some of it is lost and therefore high values ​​are not achieved. You may notice that this indicator for incandescent lamps is 12 lumens per watt, while fluorescent lamps provide 60 lumens per watt. LED lamps provide maximum illumination with minimal energy consumption - up to 90 lumens per watt.

Using this approach, it is not always possible to obtain correct results, because even light bulbs of the same type with the same power can have different ratios of luminous flux to energy costs, and the difference can be quite significant. Below is a table that allows you to convert watts to lumens for a lamp during first use. With its help you can easily find out how many lumens are in an incandescent lamp, for example.

The table shows that an LED lamp with a luminous flux of 600 lm is not equivalent to a 60 W incandescent lamp, and 1,000 lm is not equivalent to a 100 W incandescent lamp.

Parameters that determine the luminous flux indicator and its calculation

The beam consists of a stream of particles - photons. When these particles enter a person's eyes, certain visual sensations arise. The more photons hit the retina in a certain period of time, the more illuminated the object appears to us. Thus, lamps emit a luminous flux of photons, which, when entering the eyes, allow us to clearly see objects in front of us.

Unfortunately, the longer a light bulb is used, the less brightness it can produce. The lamp itself can also deteriorate the illumination indicator, because losses often depend on the quality of the lamp material. The greatest losses of luminous flux are observed in gas-discharge sources; in fluorescent lamps these losses can be 20–30%, in incandescent lamps – 10–15%. LED lamps have the highest light output - light loss is less than 5%.

To convert the luminous flux of a lamp into lumens, use the average luminous output values:

• for diode products, multiply the power by 80–90 lm/W for light bulbs with a frosted bulb and get the light flux;
• for diode filament (transparent products with yellow stripes), multiply the energy consumption by 100 lm/W;
• multiply fluorescent energy-saving lamps by 60 lm/W;
• for a HPS lamp this value will be 66 lm/W for 70W; 74 lm/W for 100W, 150W, 250W; 88 lm/W at 400W;
• for a mercury arc lamp the multiplier will be 58 lm/W;
• a 100-watt incandescent bulb produces approximately 1,200 lumens. If the power is reduced to 40 W, the flux will reach 400 lm. But a 60-watt light bulb has an indicator of about 800 lm.

If you need to accurately determine the luminous flux, you will need a lux meter. Using it you can calculate , what luminous flux will be at selected points in the room using a known method.

One lux corresponds to a certain luminous flux falling on an illuminated surface with an area of ​​one square meter. You can determine the approximate value of the luminous flux created by a particular source using the formula:

Ф = E x S,
where S is the area of ​​all surfaces of the room you are examining (in square meters), and E is the illumination (in lux).

So if the surface area is 75 sq. meters, and the illumination is 40 lux, the luminous flux is 3,000 lumens. To accurately calculate the luminous flux, many other spatial factors will have to be taken into account.

If you select an LED lamp according to all parameters correctly, if you comply with all the requirements of the manufacturer, it is guaranteed to last for many years. Currently, the least energy-consuming products that provide the most illumination are not cheap, but over time they will become available to all consumers.

Lumen (lm, lm)- unit of measurement of luminous flux in SI. Where SI is the system of units of physical quantities (French: Le Syst?me International d'Unit?s, SI).

One lumen is equal to the luminous flux emitted by a point isotropic source with a luminous intensity equal to one candela into a solid angle of one steradian (1 lm = 1 cd? sr). The total luminous flux created by an isotropic source with a luminous intensity of one candela is equal to 4? lumens.

A typical 100 W incandescent lamp produces a luminous flux of approximately 1300 lm. A 26 W compact fluorescent fluorescent lamp produces a luminous flux of approximately 1600 lm. The luminous flux of the Sun is 3.63·10 to the 28th power of lm.

Lumen is the total luminous flux from a source. However, this measurement usually does not take into account the focusing efficiency of the reflector or lens and is therefore not a direct parameter for assessing the brightness or useful performance of the beam. A wide beam of light can have the same lumens as a narrowly focused beam. Lumens cannot be used to determine beam intensity because the lumen rating includes all scattered wasted light.

Lux (lx)- unit of measurement of illumination in the SI system.

Lux is equal to the illumination of a surface with an area of ​​1 sq. m when the luminous flux of radiation incident on it is equal to 1 lumen.

100 lumens were collected and projected onto a 1-meter square area. The illumination of the area will be 100 lux. The same 100 lumens aimed at 10 square meters will produce 10 lux of illumination.

Candela (cd, cd)- one of the seven basic units of measurement of the SI system, equal to the intensity of light emitted in a given direction by a source of monochromatic radiation with a frequency of 540·10 to the 12th power of Hz, the energy intensity of which in this direction is (1/683) W/sr. Steradian (Russian designation: ср, international: sr) is a unit of measurement of solid angles.

The selected frequency corresponds to the color green. The human eye is most sensitive in this region of the spectrum. If the radiation has a different frequency, then greater energy intensity is required to achieve the same light intensity.

Previously, candela was defined as the intensity of light emitted by a black body perpendicular to a surface with an area of ​​1/60 sq. cm at the melting point of platinum (2042.5 K). In the modern definition, the coefficient of 1/683 is chosen so that the new definition matches the old one.

The intensity of light emitted by a candle is approximately equal to one candela (Latin candela - candle), so this unit of measurement was previously called a “candle”, now this name is outdated and is not used.

Luminous intensity of typical sources:

Source	Power, W	Approximate luminous intensity, cd
Candle		1
Modern (2016) incandescent lamp	100	100
Regular LED	0,015	5 mkd
Super bright LED	1	25
Ultra-bright LED with collimator	1	1500
Modern (2016) fluorescent lamp	20	100

Black Diamond is a trendsetter in the world of professional mountaineering and climbing equipment. The brand produces high-quality headlamps and pendant lamps that can be used even at a depth of one meter underwater for half an hour. BD offers travel lighting with up to 200 lumens of light output and a relatively light weight. Many flashlights are equipped with several lighting modes for ease of use on the mountaineering route and at home. Bright, light, neat and practical, BlackDiamond flashlights will not let you down even in the most extreme situations.

Luminous flux of lamps (lm)

big LED-high, big LED-med, big LED-low, 5 MM - High, 5 MM - medium, 5 MM - low

Black Diamond Lantern (BD)	Luminous flux, (lm)
Icon	200
Spot new	200
Cosmo new	90
Wiz new	30
Ion	80
Ember Power Light	150
Orbit Lantern	105
Voyager Lantern	140
Petzl flashlight	Luminous flux (lm)
Tikka XP	180
MYO XP	140

In recent years, approaches to organizing lighting in everyday life and public spaces have changed smoothly and painlessly. Now you won’t surprise anyone with LED lamps.

Stores sell LED and fluorescent lamps, but the buyer continues to keep in mind “power” as the main indicator for lighting sources. Prudent manufacturers, of course, indicate the power on the packaging of LED products, what this may mean. Should we focus on power and how to determine the correspondence between types of devices?

More information about the level of illumination that an LED light source produces can be found in the lumen output. We’ll look into what lumens mean in LED lamps in this article.

What is a lumen

The concept of lumens was established by the international measurement system in the mid-twentieth century.

Lumens measure the amount of total light emitted by a source. The parameter is directly related to the concept of luxury, but there is a difference between them.

Expert opinion

Alexey Bartosh

Ask a question to an expert

It is important to understand! Lumen is the total amount of light that a source is capable of emitting in all directions. Lux is intended to indicate how much light falls on a square meter of surface.

Therefore, if a lamp emitting 100 Lux illuminates 1 m2 of surface, then a flux of 100 Lux will fall on it. If the same light bulb shines in a room of 10 m2, then its illumination will be significantly lower. It is important to know that the calculations should take into account the entire luminous flux, in all directions.

Understanding this hides one of the advantages of LED devices over incandescent lamps and fluorescent devices that glow in all directions. For diode lamps, the lighting angle approaches 120 or 180 degrees. Using built-in or external lenses, beams of any width are obtained.

LED light bulb from inside

Conclusion: the light flux is directed and used in the desired direction, increasing its concentration.

Manufacturers actively use this feature when developing LED lamps installed instead of halogen and xenon d2s lamps in car headlights. They are cheaper than xenon, put less load on car electrics than halogen ones, and are not inferior in terms of illumination level.

Modern diodes are used to manufacture and replace 20 W lamps in side lights and 55 W lamps in car headlights.

Parameters that determine the luminous flux indicator and its calculation

Several indicators of luminous flux are important for human perception:

• The amount of everything coming from a light source.
• Wavelength. It determines how the eye perceives the brightness of light. Emission in the middle, green part of the spectrum appears brighter than the blue or red parts, given the same lamp power.
• Color temperature is measured in Kelvin and must be indicated on product packaging and data sheets. The picture shows the color temperature scale and the color of the emitted light.

Note! Warm tones are perceived by the human eye as less bright than cool colors. When purchasing “warm” lamps, make a small margin in the direction of increasing the power to create comfortable conditions in the room.

Color temperature in comparison

How many lumens are in 1 W LED bulb?

Finding out the truthful answer to a question is not so easy. The fact is that manufacturers indicate power and luminous flux for LEDs, not light bulbs. Actual values ​​can only be measured with special instruments. You should focus on averages.

In general, when consuming 1 W of power, LEDs emit 90–100 lm. Expensive samples are capable of delivering 130–140 lumens from one watt.

LEDs producing 220 Lm/W have been obtained in laboratory conditions, but the devices are not produced on an industrial scale due to their high cost.

The built-in LED power driver reduces the efficiency, reducing the luminous flux to power ratio by 5–10%. It is important to take this into account when choosing and purchasing light sources.

Converting lumens to watts

For users who do not want to study the characteristics of electrical appliances and carry out calculations, there are many resources on the Internet with built-in calculators. It is enough to substitute the data provided by the manufacturer (lumens) and select the type of lamp to obtain the required power indicator.

Method for calculating illumination for premises

Calculating the required number of lighting fixtures uses a simple technique.

Calculations are carried out in two stages:

• Calculation of the required luminous flux intensity.
• Determining the number of lamps capable of providing the required illumination.

Formula for approximate calculation of lighting level, Lm.

Luminous flux = standard illumination indicator in lux (shown in the table) * room area in m2 * ceiling height coefficient.

Table 1. Illumination standards

For ceilings up to 2.7 m, a coefficient of 1 is applied, for room heights from 2.7 to 3 m - a coefficient of 1.2, from 3 to 3.5 m - 1.5.

Calculation example. In children's rooms, the illumination standard is set at 200 Lux. Room area 12 m2 Height 3.1 m - we use a coefficient of 1.2.

Multiplying 200 * 12 * 1.2, we get the required luminous flux of 2880 Lm.

Knowing the light indicator, choose devices capable of providing it. For the given room, one LED lamp with a power of 25–30 W, or three 10-watt sources, is sufficient.

Expert opinion

Alexey Bartosh

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

Ask a question to an expert

Important! To better illuminate the room, it is wise to use several lamps. This will illuminate the room evenly and get rid of shadows.

Comparative characteristics of an incandescent lamp and an LED lamp

Power usage of different types of light bulbs

When comparing technical characteristics, all parameters speak in favor of diode devices.

Table 2. Comparison of LED and LED characteristics.

The regularly decreasing price of LED lamps and the economic benefits of their use make the devices popular among buyers.

How many lumens are there in LEDs relative to other light sources?

Table 3. Average luminous flux indicators for different power consumption.

LED lamps from trusted manufacturers have undeniable advantages when used at home and in production. They are durable, economical, and quickly pay for themselves. The ability to choose any shade of light will make your stay in the room comfortable and safe.