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Luminous flux

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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Comparison of wattage and luminous flux of various light sources

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

Illuminance requirements for various objects

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

Luminous intensity curves

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

Colour temperature (Ct)

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

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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Comparing optical modules with discrete light-emitting diodes and COB matrices

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/


Advantages of LED illumination devices

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.

Mean Well power supply units

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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"Ledprofline" was established  with the purpose organization of production of the innovative LED lighting. Innovation is to create a fundamentally new main element of the lamp - an aluminum case with technical characteristics that exceeds far the existing samples of competitors. A patent for a utility model is registered.

A full-scale production was created, which includes now design and technology department, laboratory, machining and assembly production, marketing and sales department. Design capacity is up to 5000 fixtures per month. The production is cooperative and the supply channels of individual components are provided. Tests and certification of lamps in Ukraine and Europe have been performed. Degree of protection from environmental impact - IP 67. LLC "Ledprofline" received a certificate for the quality management system ISO 9001: 2015.

The concept of the enterprise is the production of high-reliability, high-quality lighting fixtures with high-quality equipment for illumination of streets, highways, settlements, enterprises, institutions and organizations (external) and industrial premises, trade, warehouse space and other objects (internal).

The enterprise development plan involves several stages of creating a range of products. At the first, LPL-1 and LPL-2 series lamps with a capacity from 60 to 300 W were created. The second stage involves the creation of fixtures with a capacity of 20 - 60 watts. Estimated date is the first half of 2018. At other stages, other types of fixtures will be created.

When the LPL-1 and LPL-2 series lamps were creating, the designers were asked to create a shell that, in addition to aesthetic, technological and technical problems, should solve the main problem - to prevent the LEDs and the power supply from overheating, to provide an efficient cooling system.

LED lamps are the newest, most effective achievement in lighting technology. In the world LEDs are manufactured with different quality. But everyone has one significant drawback: they disastrously lose their characteristics when overheat. Characteristics of high performance of LEDs and their long lifetime depend on the operating temperature and ambient temperature. The higher the temperature is, the shorter will be the period of effective operation and the greater the degradation of the LED, that is, the irreversible significant reduction of the light flux. For example, in the leading manufacturers of LED matrices, the indicators at the maximum operating temperature on the crystal of an LED of 850C are normalized. In addition, the temperature should be measured on the crystal of the LED, and not on the radiator, which most manufacturers do not inform about.

The task of all manufacturers of LED lamps is to provide an effective cooling system (heat dissipation) from the LED due to the possible high external temperature. There are an active and a passive cooling systems. Active cooling system provides external influence on the cooling of the radiator. For example, a passenger car has a liquid (radiator) and air (fan) cooling. The passive cooling system involves removing heat from the radiator through heat radiation and natural convection. In LED lamps, as a rule, a passive cooling system is used. Its efficiency is achieved by the cooling area of ​​the radiator (case) of the lamp and the structural and technological decisions of the manufacturers.

The latest achievement in the field of light source is the LED COB (Chip-on-Board) matrix, which provides a significantly higher level of technical parameters in comparison with optical modules on discrete (individual) LEDs and significantly higher operational reliability. The essential disadvantage of COB matrix is the small size (up to 38x38 mm), which concentrate all the heat on a small area, which greatly increases the requirements for a qualitative cooling system, i.e. to the case of radiator.

The designers of LLC "Ledprofline" managed to create an original body-radiator made of foundry aluminum, which at compact dimensions 160x160x280 mm has a cooling area of 0.64 m2 and allows the use of LEDs in LPL-1 lamps of 60-150 W. The double design of the LPL-2 lamp allows a capacity of 160-300 W. Weight LPL -1 = 5.8 kg, LPL-2 = 10.1 kg. The construction of the LPL radiator shell provides efficient cooling of the COV-matrix. The area of the horizontal surfaces of the radiator housing, which can accumulate pollution that affects the heat output, is less than 5% of the total cooling surface, and the main cooling surface is concentrated on the vertical edges. This solution prevents from gunpowder, sand, leaves, snow, wastes of birds. Due to this design, the wind load decreases and the self-cleaning of the lamp is provided by rainstorms and winds, which in turn allows you to reduce significantly the cost of periodic cleaning or completely avoid this process. The above constructive solutions make impossible further reduction of the heat output under different operating conditions, which is especially important when using fixtures in countries with hot climates and for indoor lighting of various objects with elevated temperature conditions. Most manufacturers do not count their constructions above factors and give the technical parameters that were obtained in the laboratory.

Also important is the base of the radiator housing, which is attached to the LED solar mat with the help of special heat-conductive adhesive, which has a thickness of 15 mm, and provides maximum and even heat output with a temperature difference up to 100C throughout the whole radiator housing, in contrast to the lamps of most manufacturers, in which the base of the radiator is 4-5 mm thick.

The radiator housing is covered with polyester paint with excellent parameters for atmospheric stability, corrosion protection, mechanical strength, abrasion resistance and a higher heat emission factor than when anodized.

In the LPL series, the components of the world's leading manufacturers are used.

LIGHT SOURCE: LED Chip-on-board matrix - Seoul (Korea) of new generation of MJT series, and also under the order of CREE (USA), Citizen (Japan). Serial are MJT series Seoul (Korea) matrixes, the best, in our opinion, in terms of price-quality ratio. The LPL series Lamps with Seoul matrixes series MJT provide the best luminous flux and light efficiency (ratio of light flux to power consumption, Lm / W). Manufacturer's warranty (on condition to compliance with the temperature operating modes) - not less than 100,000 hours of operation or 10 years.

POWER PLANT: Mean Well (Taiwan) ELG and HLG series (best price-quality ratio) are provided with short-circuit protection, overload, overheating (temperature protection: when the power supply is heated above 85 ° C, it automatically shuts off, which prevents the luminaire from failing and prevents the matrix from degrading), overvoltage, aluminum shell, which has a much better heat output than other analogues and provides reliability and longer lifetime. The power supply data line features dimming and smart dimming. Dimming - Adjustment of power and light flow by additional lines of control of groups of fixtures. Intelligent dimming - programming of the power supply from the PC through the program, which allows you to select the optimal modes of operation of the lamp. The graph of step-by-step power level and operating time at each level is set during programming and in the future, automatically adjusted by the moments of switching on / off the lamp. This approach allows you to implement control of local fixtures without additional control lines. Manufacturer's warranty on power supplies is the period of 5 (7) years. The power supply is located in the housing of the lamp and is filled with a conductive compound, which improves greatly the heat output to the radiator housing and greatly increases the reliability and lifetime of the lamp.

OPTICS: A single lens of shock-resistant borosilicate glass is used with the necessary diagrams of light curves, incl. for street, industrial and spotlight lighting.

ACCESSORIES: Console brackets with adjustable and unregulated angle, Suspension bracket for mounting on rope, ceiling and wall.

Warranty on LPL series lamps with Mean Well power supplies series ELG is 5 years, series HLG is 7 years. In some cases, we provide 10 years of warranty. The warranty coveres a reliable operation of the lamp during a certain period with loss of light flux not more than 5%.

More complete information about the company and products is available on the site:  

The model line is available on the site:  

Technical specifications are on the site:

The company also provides services:

  • Creation of lighting systems projects

  • Calculation and selection of necessary fixtures

  • Creation and modernization of lighting control systems

  • Consultation

  • Assembling

  • Supply of lighting pillars

  • Complete set of lamps with motion sensors, autonomous lighting systems (solar panels, energy storage devices)