The difference between suites and lumens. Illumination rate of living space

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1 lux [lx] = 1.46412884333821E-07 watts per sq. cm (at 555 nm) [W / cm² (555 nm)]

Initial value

Converted value

lux meter-candela centimeter-candela foot-candela phot nox candela-steradian per sq. meter lumens per sq. meter lumens per sq. centimeter lumens per sq. foot watt per sq. cm (at 555 nm)

More about illumination

General information

Illuminance is a luminous quantity that determines the amount of light that hits a given area of the body's surface. It depends on the wavelength of light, since the human eye perceives the brightness of light waves of different lengths, that is, different colors, in different ways. Illumination is calculated separately for different wavelengths, since people perceive light with a wavelength of 550 nanometers (green), and colors that are nearby in the spectrum (yellow and orange), as the brightest. Light generated by longer or shorter wavelengths (violet, blue, red) is perceived as darker. Illumination is often associated with the concept of brightness.

Illumination is inversely proportional to the area over which the light falls. That is, when illuminating the surface with the same lamp, the illumination of a larger area will be less than the illumination of a smaller area.

Difference between brightness and illumination

Brightness Illumination

In Russian, the word "brightness" has two meanings. Brightness can mean a physical quantity, that is, a characteristic of luminous bodies equal to the ratio of the intensity of light in a certain direction to the area of the projection of the luminous surface onto a plane perpendicular to this direction. It can also define a more subjective concept of overall brightness, which depends on many factors, such as the characteristics of the eyes of the person who is looking at this light, or the amount of light in the environment. The less light around you, the brighter the light source appears. In order not to confuse these two concepts with illumination, it is worth remembering that:

brightness characterizes light, reflected from the surface of a luminous body or sent by this surface;

illumination characterizes falling light onto the illuminated surface.

In astronomy, brightness characterizes both the emitting (stars) and reflective (planets) ability of the surface of celestial bodies and is measured on the photometric scale of stellar brightness. Moreover, the brighter the star, the lower the value of its photometric brightness. The brightest stars have negative stellar brightness.

Units

Illumination is most often measured in SI units. suites... One lux equals one lumen per square meter. Those who prefer imperial units to metric units use to measure illumination foot candela... It is often used in photography and cinema, as well as in some other areas. The foot is used in the name because one foot-candela denotes the illumination of one candela of a surface of one square foot, which is measured at a distance of one foot (a little over 30 cm).

Photometer

A photometer is a device that measures illumination. Usually the light is sent to a photo detector, converted into an electrical signal and measured. Sometimes there are photometers that work on a different principle. Most photometers provide lux information, although other units are sometimes used. Photometers, called exposure meters, help photographers and operators determine shutter speed and aperture. In addition, photometers are used to determine safe illumination in the workplace, in crop production, in museums, and in many other industries where it is necessary to know and maintain a certain illumination.

Illumination and safety in the workplace

Working in a dark room can lead to visual impairment, depression, and other physiological and psychological problems. That is why many labor protection rules include requirements for minimum safe illumination of the workplace. Measurements are usually carried out with a photometer, which gives the final result depending on the area of propagation of the light. This is necessary in order to provide sufficient illumination throughout the room.

Illumination in photo and video shooting

Most modern cameras have built-in exposure meters to simplify the work of the photographer or operator. A light meter is necessary so that the photographer or operator can determine how much light needs to be transmitted onto the film or photomatrix, depending on the illumination of the object being shot. Illumination in lux is converted by the exposure meter into possible combinations of shutter speed and aperture, which are then selected manually or automatically, depending on how the camera is configured. Usually the combinations suggested depend on the settings in the camera and what the photographer or cameraman wants to portray. In the studio and on set, an external or in-camera light meter is often used to determine if the light sources being used are providing sufficient lighting.

To receive good photos or video material in poor lighting conditions, a sufficient amount of light must enter the film or sensor. This is not difficult to achieve with a camera - you just need to set the correct exposure. The situation with video cameras is more complicated. For high quality video, you usually need to install additional lighting, otherwise the video will be too dark or with a lot of digital noise. This is not always possible. Some camcorders are specially designed for shooting in low light conditions.

Cameras designed for shooting in low light conditions

There are two types of cameras for shooting in low light conditions: some use more optics than high level while others have more advanced electronics. The optics let more light into the lens, and the electronics are better at processing even the smallest light that enters the camera. It is usually with electronics that the problems and side effects described below are associated. High-aperture optics allow you to shoot higher quality video, but its disadvantages are additional weight due to a large number glass and a significantly higher price.

In addition, the quality of shooting is influenced by the single-matrix or three-matrix photo matrix installed in video and photo cameras. In a three-matrix matrix, all incoming light is divided by a prism into three colors - red, green and blue. Image quality in dark conditions is better in three-array cameras than in single-array cameras, since less light is scattered when passing through a prism than when it is processed by a filter in a single-array camera.

There are two main types of photo matrices - charge-coupled devices (CCDs) and made on the basis of CMOS technology (complementary metal oxide semiconductor). In the first, a sensor is usually installed, which receives light, and a processor that processes the image. In CMOS sensors, the sensor and processor are usually combined. In low light conditions, CCD cameras usually produce better image quality, and the advantage of CMOS sensors is that they are cheaper and consume less power.

The size of the image sensor also affects the image quality. If shooting takes place with a small amount of light, then the larger the matrix, the better quality image, and the smaller the matrix, the more problems with the image - digital noise appears on it. Larger sensors are installed in more expensive cameras, and they require more powerful (and, as a result, heavier) optics. Cameras with such matrices allow you to shoot professional video. For example, recently a number of films have appeared entirely shot on cameras such as the Canon 5D Mark II or Mark III, which have a matrix size of 24 x 36 mm.

Manufacturers usually indicate in what minimum conditions the camera can operate, for example, with an illumination of 2 lux or more. This information is not standardized, that is, the manufacturer decides for himself which video is considered to be of high quality. Sometimes two cameras with the same minimum illumination will give different quality shooting. The EIA (Electronic Industries Association) in the United States has proposed a standardized system for determining the sensitivity of cameras, but so far it is used only by a few manufacturers and is not universally accepted. Therefore, often, in order to compare two cameras with the same light characteristics, you need to try them in action.

On this moment any camera, even one designed for low light conditions, can produce poor quality images with high graininess and afterglow. To solve some of these problems, it is possible to take the following steps:

Shoot on a tripod;
Work in manual mode;
Do not use variable focal length mode, but instead move the camera as close to the subject as possible;
Do not use auto focus and auto ISO selection - higher ISO values increase noise;
Shoot with a shutter speed of 1/30;
Use diffused light;
If it is not possible to install additional lighting, then use all possible light around, such as street lamps and moonlight.

Despite the lack of standardization about the sensitivity of cameras to light, for night photography it is still better to choose a camera that says it works at 2 lux or lower. Also keep in mind that even though the camera is really good at shooting in dark conditions, its Lux sensitivity to illumination is the sensitivity to light directed at an object, but the camera actually receives light reflected from the object. When reflected, part of the light is scattered, and the further the camera is from the object, the less light enters the lens, which degrades the quality of shooting.

Exposition number

Exposition number(English Exposure Value, EV) - an integer characterizing possible combinations excerpts and diaphragm in a photo, film or video camera. All combinations of shutter speed and aperture, in which the same amount of light falls on the film or photosensitive matrix, have the same exposure number.

Several combinations of shutter speed and aperture in the camera at the same exposure number allow you to get approximately the same image density. However, the images will be different. This is due to the fact that at different aperture values, the depth of field will be different; at different shutter speeds, the image on the film or matrix will remain for different times, as a result of which it will be blurred to varying degrees or not at all. For example, combinations of f / 22 - 1/30 and f / 2.8 - 1/2000 are characterized by the same exposure number, but the first image will have a greater depth of field and may be blurry, and the second will have a shallow depth of field and, quite possibly will not be smeared at all.

Higher EV values are used when the subject is better lit. For example, an exposure value (at ISO 100) EV100 = 13 can be used when shooting a landscape if the sky is cloudy, and EV100 = –4 is suitable for shooting a bright aurora.

A-priory,

EV = log 2 ( N 2 /t)

2 EV = N 2 /t, (1)

N- f-number (for example: 2; 2.8; 4; 5.6, etc.)
t- shutter speed in seconds (for example: 30, 4, 2, 1, 1/2, 1/4, 1/30, 1/100, etc.)

For example, for a combination of f / 2 and 1/30, the exposure value is

EV = log 2 (2 2 / (1/30)) = log 2 (2 2 × 30) = 6.9 ≈ 7.

This number can be used for night scenes and illuminated shop windows. A combination of f / 5.6 with a shutter speed of 1/250 gives an exposure value

EV = log 2 (5.6 2 / (1/250)) = log 2 (5.6 2 × 250) = log 2 (7840) = 12.93 ≈ 13,

which can be used to capture a landscape with a cloudy sky and no shadows.

It should be noted that the argument of the logarithmic function must be dimensionless. In determining the exposure number EV, the dimension of the denominator in formula (1) is ignored and only the numerical value of the shutter speed in seconds is used.

The relationship of the exposure number with the brightness and illumination of the subject

Determining the exposure by the brightness of the light reflected from the subject

When using exposure meters or lux meters that measure the light reflected from the subject, shutter speed and aperture are related to the brightness of the subject as follows:

N 2 /t = LS/K (2)

N- f-number;
t- exposure in seconds;
L- average scene brightness in candelas per square meter (cd / m²);
S- arithmetic value of photosensitivity (100, 200, 400, etc.);
K- calibration factor of the exposure meter or lux meter for reflected light; Canon and Nikon use K = 12.5.

From equations (1) and (2) we obtain the exposure number

EV = log 2 ( LS/K)

2 EV = LS/K

At K= 12.5 and ISO 100, we have the following equation for brightness:

2 EV = 100 L/12.5 = 8L

L= 2 EV / 8 = 2 EV / 2 3 = 2 EV – 3.

Illumination and museum exhibits

The rate at which decay, fade, and otherwise deteriorate museum exhibits, depends on their illumination and on the strength of the light sources. Museum staff measure the illumination of exhibits to make sure that a safe amount of light is entering the exhibits, and also to provide enough light for visitors to get a good look at the exhibit. Illumination can be measured with a photometer, but in many cases it is not easy, since it must be as close to the exhibit as possible, and for this it is often necessary to remove the protective glass and turn off the alarm, as well as obtain permission for this. To facilitate the task, museum workers often use cameras as photometers. Of course this is not a substitute accurate measurements in a situation where a problem is found with the amount of light that enters the exhibit. But in order to check whether a more serious check with a photometer is needed, a camera is enough.

The exposure is determined by the camera based on the light readings, and knowing the exposure, you can find the light with a few simple calculations. In this case, museum staff use either a formula or a table with the conversion of exposure into light units. During calculations, do not forget that the camera absorbs part of the light, and take this into account in the final result.

Illumination in other areas of activity

Gardeners and plant breeders know that plants need light for photosynthesis, and they know how much light each plant needs. They measure light in greenhouses, orchards and vegetable gardens to make sure each plant is getting enough light. Some people use photometers for this.

Do you find it difficult to translate a unit of measurement from one language to another? Colleagues are ready to help you. Post a question to TCTerms and you will receive an answer within a few minutes.

And the luminous flux, respectively, and they must be distinguished. The amount of luminous flux characterizes the light source, and the level of illumination characterizes the state of the surface on which the light falls. Lux (Lx) is used to measure illumination, and lumen (Lm) is used to characterize the light source.

You will need
- calculator.

According to the definition, an illumination of one lux produces a light source with a luminous flux of one lumen if it evenly illuminates a surface of one square meter. Therefore, to convert lumens to suites, use the formula:
Klux = Klumen / Km²
To convert suites to lumens, apply the formula:
Klumen = Klux * Km²,
where:
Klux - illumination (number of lux);
Klumen - the amount of luminous flux (the number of lumens);
Km² - illuminated area (in square meters).

When calculating, keep in mind that the lighting should be uniform. In practice, this means that all points on the surface must be equidistant from the light source. In this case, the light must hit all areas of the surface at the same angle. Also note that the entire luminous flux emitted by the light source must fall on the surface.

If the light source is close in shape to a point light, then uniform illumination can be achieved only on the inner surface of the sphere. However, if the luminaire is sufficiently distant from the illuminated surface, and the surface itself is relatively flat and has a small area, then the illumination can be considered almost uniform. A "striking" example of such a light source can be considered the sun, which, due to its great distance, is almost a point source of light.

Example: In the center of a 10 meter high cubic room, there is a 100 W incandescent lamp.
Question: what will be the illumination of the room ceiling?
Solution: a 100 watt incandescent lamp generates a luminous flux of approximately 1300 lumens (lm). This stream is distributed over six equal surfaces (walls, floor and ceiling) with a total area of 600 m². Therefore, their illumination (average) will be: 1300/600 = 2.167 Lx. Accordingly, the average illumination of the ceiling will also be equal to 2.167 Lx.

To solve the inverse problem (determining the luminous flux for a given illumination and surface area), simply multiply the illumination by the area.

However, in practice, the luminous flux created by a light source is not calculated in this way, but is measured using special devices - spherical photometers and photometric goniometers. But since most light sources have standard characteristics, for practical calculations, use the following table:
Incandescent lamp 60 W (220 V) - 500 lm.
Incandescent lamp 100 W (220 V) - 1300 lm.
Fluorescent lamp 26 W (220 V) - 1600 lm.
Sodium gas discharge lamp(street) - 10,000 ... 20,000 lm.
Low pressure sodium lamps - 200 Lm / W.
LEDs - about 100 Lm / W.
Sun - 3.8 * 10 ^ 28 Lm.

Lm / W is an indicator of the efficiency of a light source. So, for example, a 5 W LED will provide a luminous flux of 500 lm. Which corresponds to a 60W incandescent lamp!

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1 lux [lx] = 0.0929030400000839 lumens per sq. ft [lm / ft²]

Initial value

Converted value

lux meter-candela centimeter-candela foot-candela phot nox candela-steradian per sq. meter lumens per sq. meter lumens per sq. centimeter lumens per sq. foot watt per sq. cm (at 555 nm)

American wire gauge

More about illumination

General information

Difference between brightness and illumination

Brightness Illumination

brightness characterizes light, reflected from the surface of a luminous body or sent by this surface;

illumination characterizes falling light onto the illuminated surface.

Units

Photometer

Illumination and safety in the workplace

Illumination in photo and video shooting

To obtain good photographs or video footage in low light conditions, there must be enough light on the film or sensor. This is not difficult to achieve with a camera - you just need to set the correct exposure. The situation with video cameras is more complicated. For high quality video, you usually need to install additional lighting, otherwise the video will be too dark or with a lot of digital noise. This is not always possible. Some camcorders are specially designed for shooting in low light conditions.

Cameras designed for shooting in low light conditions

There are two types of cameras for low-light photography, some with higher-end optics and others with more advanced electronics. The optics let more light into the lens, and the electronics are better at processing even the smallest light that enters the camera. It is usually with electronics that the problems and side effects described below are associated. High-aperture optics allow you to shoot video of higher quality, but its disadvantages are additional weight due to the large amount of glass and a significantly higher price.

The size of the image sensor also affects the image quality. If shooting takes place with a small amount of light, then the larger the matrix, the better the image quality, and the smaller the matrix, the more problems with the image - digital noise appears on it. Larger sensors are installed in more expensive cameras, and they require more powerful (and, as a result, heavier) optics. Cameras with such matrices allow you to shoot professional video. For example, recently a number of films have appeared entirely shot on cameras such as the Canon 5D Mark II or Mark III, which have a matrix size of 24 x 36 mm.

Manufacturers usually indicate in what minimum conditions the camera can operate, for example, with an illumination of 2 lux or more. This information is not standardized, that is, the manufacturer decides for himself which video is considered to be of high quality. Sometimes two cameras with the same minimum illumination value will give different shooting quality. The EIA (Electronic Industries Association) in the United States has proposed a standardized system for determining the sensitivity of cameras, but so far it is used only by a few manufacturers and is not universally accepted. Therefore, often, in order to compare two cameras with the same light characteristics, you need to try them in action.

At the moment, any camera, even one designed for low light conditions, can produce a picture of poor quality, with high graininess and afterglow. To solve some of these problems, it is possible to take the following steps:

Shoot on a tripod;
Work in manual mode;
Do not use variable focal length mode, but instead move the camera as close to the subject as possible;
Do not use auto focus and auto ISO selection - higher ISO values increase noise;
Shoot with a shutter speed of 1/30;
Use diffused light;
If it is not possible to install additional lighting, then use all possible light around, such as street lamps and moonlight.

Exposition number

A-priory,

EV = log 2 ( N 2 /t)

2 EV = N 2 /t, (1)

N- f-number (for example: 2; 2.8; 4; 5.6, etc.)
t- shutter speed in seconds (for example: 30, 4, 2, 1, 1/2, 1/4, 1/30, 1/100, etc.)

For example, for a combination of f / 2 and 1/30, the exposure value is

EV = log 2 (2 2 / (1/30)) = log 2 (2 2 × 30) = 6.9 ≈ 7.

This number can be used for night scenes and illuminated shop windows. A combination of f / 5.6 with a shutter speed of 1/250 gives an exposure value

EV = log 2 (5.6 2 / (1/250)) = log 2 (5.6 2 × 250) = log 2 (7840) = 12.93 ≈ 13,

which can be used to capture a landscape with a cloudy sky and no shadows.

The relationship of the exposure number with the brightness and illumination of the subject

Determining the exposure by the brightness of the light reflected from the subject

When using exposure meters or lux meters that measure the light reflected from the subject, shutter speed and aperture are related to the brightness of the subject as follows:

N 2 /t = LS/K (2)

N- f-number;
t- exposure in seconds;
L- average scene brightness in candelas per square meter (cd / m²);
S- arithmetic value of photosensitivity (100, 200, 400, etc.);
K- calibration factor of the exposure meter or lux meter for reflected light; Canon and Nikon use K = 12.5.

From equations (1) and (2) we obtain the exposure number

EV = log 2 ( LS/K)

2 EV = LS/K

At K= 12.5 and ISO 100, we have the following equation for brightness:

2 EV = 100 L/12.5 = 8L

L= 2 EV / 8 = 2 EV / 2 3 = 2 EV – 3.

Illumination and museum exhibits

The rate at which museum exhibits decay, fade and otherwise deteriorate depends on their illumination and on the strength of the light sources. Museum staff measure the illumination of exhibits to make sure that a safe amount of light is entering the exhibits, and also to provide enough light for visitors to get a good look at the exhibit. Illumination can be measured with a photometer, but in many cases it is not easy, since it must be as close to the exhibit as possible, and for this it is often necessary to remove the protective glass and turn off the alarm, as well as obtain permission for this. To facilitate the task, museum workers often use cameras as photometers. Of course, this is not a substitute for accurate measurements in a situation where a problem is found with the amount of light that enters the exhibit. But in order to check whether a more serious check with a photometer is needed, a camera is enough.

Illumination in other areas of activity

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Lumen is a unit for measuring the brightness of radiation. It is a luminous quantity in the international system of units. Lumen refers to the amount of light emitted from a source. It is a more accurate value than power, since light sources with the same power, but different efficiency and spectral characteristics, emit an unequal light flux.

What is Lumen?

There are several units for measuring illumination. The main values are lux and lumens. Their difference lies in the fact that lux indicates the illumination of a unit of surface area, and lumen is a unit of measurement of the total radiation flux of a light source. Thus, the higher the lux value, the brighter the illuminated surface, and the higher the lumen, the brighter the lamp itself. This distinction helps to assess the effectiveness of lighting devices of various designs.

It is necessary to consider what lumens are in LED lamps. This will help to understand the fact that such light sources are characterized by directional radiation. Incandescent and fluorescent lamps emit light in all directions. To obtain the same illumination of the surface, LED elements of lower brightness are required, since the radiation is concentrated in one direction.

Incandescent and economical lamps give non-directional radiation, which requires the use of reflectors (reflectors), redirecting the light flow in the required direction. When using LED devices, there is no need for reflectors.

Parameters that determine the luminous flux indicator and its calculation

The illumination parameters are influenced not only by the brightness level of the light sources. Consider:

The wavelength of the emitted light. Lighting with a color temperature of 4200 K, which corresponds to the natural white color, is better perceived by vision than closer to the red or blue part of the spectrum.
Direction of light propagation. Narrow beam lighting fixtures allow you to concentrate light emission in the right place without installing brighter fixtures.

The luminous flux in lumens is rarely indicated by manufacturers, since most buyers are guided by the power of the lamps and their color temperature.

How many lumens are in 1 watt of an LED light bulb

Manufacturers of lighting equipment do not always put a complete list of characteristics on the product packaging. This could be for several reasons:

the habit of buyers to evaluate the brightness of light bulbs by power consumption;
unscrupulous manufacturers do not bother to take the necessary measurements.

The problem is that the radiation level of LEDs and structures made on their basis is unequal:

part of the flow is retained by a protective flask;
there are several LEDs in the LED lamp;
some of the power is dissipated by the LED driver;
brightness depends on the amount of current through the LED.

An accurate determination is possible only with the help of measuring instruments (luxometers), but for some types of LEDs it will be possible to give approximate data:

LEDs in a matte bulb - 80-90 Lm / W;
LEDs in a transparent bulb - 100-110 Lm / W;
single LEDs - up to 150 lm / W;
experimental models - 220 lm / W.

The listed data can be used to determine the current consumption when using LED devices for which the brightness value is determined. If installed LED Spotlight with transparent protective glass and its brightness parameter is declared as 3000 lumens, then the power consumption will be 30 watts. Knowing the power and supply voltage, it is easy to determine the current consumption.

Converting lumens to watts

To compare the efficiency of light sources different types and structures, it is convenient to have a table in front of you, which contains data on the power of lighting devices with the same brightness values.

Illumination rate of living space

The illumination of premises for different purposes is not the same and can differ by an order of magnitude. The number of lumens per square meter by type of living space is as follows:

study, library, workshop - 300;
children's room - 200;
kitchen, bedroom - 150;
bath, sauna, swimming pool - 100;
wardrobe, corridor - 75;
hall, corridor, bathroom, bathroom - 50;
staircase, basement, attic - 20.

Calculation of illumination for rooms

To determine the illumination of a room, you need to know the following parameters:

E - normative value illumination (how many lumens are needed per 1 square meter).
S is the area of the room.
k - height coefficient:
- k = 1 at a ceiling height of 2.5 - 2.7m;
- k = 1.2 at a ceiling height of 2.7 - 3.0m;
- k = 1.5 with a ceiling height of 3.0 - 3.5m;
- k = 2 with a ceiling height of 3.5 - 4.5m;

The calculation formula is simple:

Knowing the illumination, it is possible to select the required luminous flux and power of the lighting lamps, taking into account their differences in production technologies and the principle of operation. It is necessary to take into account the peculiarity of human vision, for whom light sources with a bluish tint (starting with a color temperature of 4700K and above) seem less bright.

Comparative characteristics of incandescent lamp and LED lamp

Above was a table that compared the power of different types of devices for one brightness value. The table shows how many lumens are in an incandescent lamp, in fluorescent and LED lamps.

The efficiency of the devices differs by more than an order of magnitude. It is immediately clear that the comparison is in favor of modern light sources. And this is even without taking into account the great durability of LED light sources. According to some manufacturers, the lifespan of LED elements can be tens of thousands of hours. The energy savings over the lifetime of the LED light sources are repaid many times over.

Incandescent lamps of 100 W are the most suitable for lighting domestic premises. Unsatisfactory efficiency, low service life have led to the fact that filament light sources are being replaced by more modern, efficient and durable devices. A 12W LED lamp produces a light output of the same brightness as the lumens in a 100W incandescent lamp.

Characteristics of the main indicators as applied to lighting: suites, lumens, kelvin, watts. Read on!

Given the current economic situation in our country, now is the time to switch to LED lighting. Why? LED lamps consume much less electricity compared to other light sources, and in terms of their technical characteristics they significantly surpass, for example, the same incandescent lamps.

However, before you go to the LED equipment store, you need to know some of the characteristics of such devices, taking into account which you can choose exactly the lighting device whose characteristics will fully meet the operating conditions. In this article, we will talk about what watts, lumens, lux and kelvin mean on LED markings, and also talk about the advantages of LED devices over other light sources.

Watts, lux, lumens, kelvins, as the main characteristics of LEDs

When buying incandescent lamps, the consumer is guided by the number of watts indicated on the label, thereby determining how brightly the product will shine. In LEDs, this figure has a completely different meaning.

The number of watts indicated by the manufacturer on the packaging does not characterize the brightness of the device, but the amount of electricity consumed per hour of operation. Naturally, you can draw a parallel between incandescent lamps and LEDs, focusing only on power. There are even special tables for this. So, for example, an LED device with a power of 8-12 watts will shine as brightly as an incandescent lamp with a characteristic of 60 watts. However, the basic unit that determines the brightness of LED lamps is lumens.

What are lumens in LED bulbs

By lumen is meant the amount of luminous flux that is emitted by a source of illumination with a force equal to one candela per angle of one steradian.

For example! An incandescent lamp with a power of 100 W is able to create a luminous flux equal to 1300 lumens, while a much lower power LED is able to produce a similar indicator.

However, in addition to lumens, LED equipment is also characterized by the amount of illumination, which is measured in lux.

What is Lux in Lighting

Lux is a unit of measure for illumination, which equals the illumination of a surface of one square meter with a luminous flux equal to one lumen. So, for example, if you project 100 lumens onto an area of 1 square meter, then the illumination index will be 100 lux. And if a similar luminous flux is directed over ten square meters, then the illumination will be only 10 lux.

Now, when you are asked: "suites and lumens, what is the difference?", You can show off your knowledge and give the interlocutor an exhaustive answer to his question.

What is Kelvin in lighting

As you've probably noticed, incandescent light has a warm yellowish tint, while LEDs have a wide color gamut. So, LED equipment is capable of displaying colors from violet to red (in the spectrum of white and yellow colors). However, the most common colors are bright white, soft or warm white. Why are we telling you this? The thing is that you can determine the color of light by marking the product. To do this, you need to look at such technical characteristics as color temperature, which is measured in Kelvin. The lower the number, the more yellow (warmer) the light will be emitted.

For example, a typical incandescent lamp has a color temperature that ranges between 2700 - 3500 Kelvin. Thus, if you want to purchase an LED lighting fixture that has the same color as an incandescent lamp, choose an LED fixture with a similar color temperature.

Various types of industrial lamps, their advantages and disadvantages

Below is a comparative table of different types of industrial lamps.

Lamp type	Dignity	disadvantages
Incandescent lamps	Ease of manufacture Short burn-up period The luminous flux at the end of the service life decreases slightly	Low efficiency Low light output Uniform spectral composition of color Short service life
Mercury Discharge Lamp	Low electricity consumption Average efficiency	Intense ozone formation during combustion Low color temperature Low color rendering index Continuous flare-up
Arc sodium tube lamps	Relatively high luminous efficiency Long service life	Long burn-up time Low environmental performance
Fluorescent lamps	Good light output Variety of light shades Long service life	High rate of chemical hazard Flickering lamps The need to use additional equipment for starting Low power factor
LED lamp	Low power consumption Long service life High durability resource Variety of colors of the luminous flux Low operating voltage High rate of environmental and fire safety Adjustable intensity	Relatively high price

Based on this table, we can conclude that LED lamp in almost all respects they are superior to other types of lighting elements. As for the price, this factor can hardly be called a significant drawback. In addition, with the question of choosing and installing LED equipment, for example, it will pay for itself in a relatively short time.

Consult about technical characteristics and LED industrial lamps, as well as choose from the product you need, you can on our website. Also, our specialists will conduct the current lighting at your facility and offer a suitable system for modernization.