Useful information

Luminous flux

Characterises emission power of visible optical radiation impacting human eye, expressed in a special measuring unit: lumen [lm]. The luminous flux is the most important characteristic of a lamp. A conventional 100 Watt incandescent lamp has a luminous flux of 1,300 lumens whereas the luminous flux of a 70 Watt metalohalogen lamp is 6,000 lumens.

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Incandescent lamp wattage, W Luminescent lamp wattage, 
LED lamp wattage, 
20 5-7 2-3 250
40 10-13 4-5 400
60 15-16 8-10 700
75 18-20 11-12 700
100 25-30 12-15 1200
150 40-50 18-20 1800
200 60-80 25-30 2500
Illuminator with a mercury luminescent
arc lamp
Illuminator with a sodium tubular arc lamp LED illuminator, W Luminous 
125 70 30-40 3500
250 100 40-60 8000
400 150 80-120 12000
700 250 140-160 20000
1000 400 180-200 30000
Objects Required horizontal illuminance value, lx (luxen)
Highways/motorways and public urban roads with traffic intensity (both ways) of 1,000 vehicles / hour 20

Highways/motorways and raion (county) roads with traffic intensity (both ways) of up to 1,000 vehicles / hour

Highways/motorways and public urban roads with traffic intensity (both ways) of 500 to 1,000 vehicles / hour
Roads and local streets with traffic intensity (both ways) of over 500 vehicles / hour 6

Highways/motorways and raion (county) roads with traffic intensity (both ways) of 500 to 1,000 vehicles / hour

Roads and local streets with traffic intensity below 500 vehicles / hour

Standard diagrams of angular distribution of luminous intensity, also known as luminous intensity curves, can be found in GOST 17677-82 (ГОСТ 17677-82) standard.

They are classified according to two independent indicators: the direction of maximum luminour intensity and the LIC aspect ratio which is understood as the ratio of maximum luminous intensity in the given meridional plane to the arithmetic mean luminous intensity of the illuminating device for the said plane. Read more

Ct definition

This is one of the major characteristics of the light sources; it determines the chromaticity of lamps and the colour values (warm, neutral, or cool) of spaces illuminated by the said lamps. It roughly corresponds to the temperature of heated body that is of the same colour as the specified light source. It is expressed in Kelvin Temperature Scale: t° = (Centigrade/°C +273) °K.

Below are Tc values for certain selected sources:

– candle flame – 1,900°K;

– incandescent lamps – 2,500°K to 3,000°K;

– Luminescent lamps – 2700°K to -6500°K;

– Sun – 5,000°K to 6,000 °K;

– Clouded sky – 6,000°K to 7,000°K;

– Bright sky – 10,000°K to 20,000°K.



Light-emitting diode

The majority of LED illuminators produced in the present day represent an earlier generation of illumination equipment using optical modules with discrete cased light-emitting diodes installed on a metallised printed circuit board. In comparison to COB (Chip-on-Board) matrices of similar wattage, this previous generation hardware has larger dimensions and mass due to the fact that the substrates of its modules are of considerable size. 
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Optical modules with discrete light emitting diodes (previous generation of illuminators) have the following properties:


  • produced with discrete cased light emitting diodes, they enhance heat transfer from the crystal to the heating element
  • a more extensive characteristic spread of light emitting diodes reduces the reliability of illuminators
  • increased dimensions of optical modules as compared to COB matrices lead to an increase in the dimensions of illuminators
  • additional assemblage of optical modules is required in the conditions of small batch manufacturing, with no guarantee that proper quality be attained
  • secondary optics items are in most cases custom-specific for each light emitting diode and thus the ultimate precision level of production and assemblage does not allow to obtain a uniform illumination diagram of proper quality and also requires more workmanship effort to produce it
  • additional protective glass pane reduces transmittance of the luminous flux to 90%.

Optical modules on COB matrices have the following properties: :

  • these are ready made items produced in the conditions of mass automated production
  • high quality of assemblage and identical characteristics of various items
  • caseless LED crystals of the matrix improve heat transfer to the radiator and thereby significantly enhance the operational reliability of matrices
  • compact dimensions allow to attain uniform light emission from a pinpoint light source
  • optics used in this hardware is a singular lens made of shock-resistant borosilicate glass with the required illuminance diagram allowing to attain luminous flux transmittance of at least 95%, providing protection from mechanical damages and matrix hermetic sealing up to IP 68.


To read more on the topic of the history of development and application of LEDs and COB matrices, please go to (COB matrices/


LED illuminators are recommended options to replace incandescent lamps, mercury-filled lamps (Mercury Luminescent Arc Lamps/DRL – 150, 250, 400) and sodium-filled lamps (Sodium Tubular Arc Lamps/DNaT – 150, 250, 400) which allow to substantially reduce power consumption expenses. A 60W LED illuminator is, in terms of a luminous flux, equal to Mercury Luminescent Arc Lamps/DRL 250 but its operational expenses are 10 times lower.

Founded back in 1982, MEAN WELL company is a major global producer of switch-mode power supply units.  At the present time, MEAN WELL corporation is comprised of four independent partner companies based in Taiwan, China, USA, and Europe. These are: MEAN WELL Enterprises Co., Ltd., MEAN WELL (GuangZhou) Electronics Co., Ltd., SuZhou MEAN WELL Technology Co., Ltd., MEAN WELL USA, Inc., and MEAN WELL Europe B.V. Range of products offered includes switch-mode power supply units, direct current (DC) converters, inverters, and battery chargers.

Application of LED lenses

LED optics is designed to redistribute the light emitted by light emitting diodes across the space in accordance with geometry stipulated by the project. We differentiate between primary and secondary optics. A secondary optical system is actually not a part of the construction of the light-emitting diodes per se rather a part of the LED illumination devices. Same as any other illuminator featuring a gaseous discharge lamp or an incandescent lamp, an illuminator with LED requires an optical system that would, on the one hand, effectively distribute the emitted light by either focusing it on a certain spot or dissipating it; on the other hand, secondary optics also additionally protects the light source from the impact that may be inflicted by factors of the environment.

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