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Energy conservation and environmental protection are in the doldrums, which coincides with the rise of the LED lighting industry, and a large number of technology companies have invested in this emerging industry. Because the LED lighting reliability performance standards have not been properly set in real time, a large number of products can not pass the test of severe light decay. The reason is that no theoretical research is designed to examine the pillars, thus causing doubts about the use of the owners and delaying the opportunity for industrial development. I would like to talk about the high-performance LED street light components to the lighting system, the important technical pointer specifications data for advanced reference.
1.) LED chip & package component luminous efficiency key technology pointer:
The key technologies of LED chip & package components, the US and Japanese manufacturers have already produced a breakthrough in luminous efficiency of 100~120 lm/W or more, surpassing the traditional highest efficiency HID light source (lighting efficiency 90~110 lm/W), and the illumination of the lamp is increased to ã„’ 60 lm / W, to meet the long-term light decay of road lighting, in line with international standards, the average illuminance of 25 ~ 40Lux specifications and energy-saving 50 ~ 80% demand.
2.) LED luminous efficiency VS temperature rise and life specification key technical indicators:
Check the CREE or Osram LED release data, the chip PN junction operating temperature Tj <85 °C to ensure a working life of 50,000 hours, and the chip PN junction to its own thermal pad (Tjs) temperature rise to ΔT = 6 ~ 15 ° C . In addition, the LED light efficiency is inversely proportional to the operating temperature. For every 10°C increase, the light decay is 5~8%, and the life expectancy is halved. The general idea that the LED can work at 100°C can reach 100,000 hours or more. It’s a long way off.
3.) LED street light system heat transfer heat VS ambient temperature key technology pointer:
The working temperature of the luminaire system shall not be higher than 85-10=75°C. The specifications of the LED road lighting demonstration luminaires specified by the Institute of Industrial and Technological Engineering indicate that the ambient temperature of the durability test is 60°C. Therefore, the temperature rise of the street lamp cooling system must be less than ΔTã„‘15°C, with 150WLED street lamps of the company. For example, the temperature rise test of the heat transfer system is as low as ΔTã„‘12~15°C, and the thermal resistance value is calculated as Tr=0.08~0.1°C/W, while the temperature rise test of the general design system is ΔTã„30~40°C, and the thermal resistance is calculated. The value Tr=0.2~0.26°C/W, the life will be shortened by 2 times and the light decay is 15% or more. In addition, the temperature rise of the heat dissipation system of the 350W LED luminaire can still achieve ΔT=15°C, and the thermal resistance value Tr=0.04°C/W.
4.) Key technologies for heat transfer method of LED street lamp system:
The heat transfer method of electronic equipment is suitable for low-power and low-order natural heat dissipation methods. At present, the temperature rise of MR16/PAR30 from 3~100W product system has reached 30~40°C. If the design is more than 100~250W and still uses the natural heat dissipation method, it must consume a large amount of aluminum alloy material to increase the thermal conductivity and the large heat exchange area, and the volume weight ranges from 15 to 30Kg. The cost of aluminum alloy materials alone is increased by 30~70 dollars. For example, the high-end products such as computer CPUs use 10 times of active heat dissipation method for natural heat dissipation. The high-efficiency military standard micro-fans guarantee 50,000 hours of IP65 waterproof and dustproof. The temperature rise of the lamp system is as low as ΔTㄑ12~15°C, and the temperature drop is above 20°C compared with the natural heat dissipation method. The lifetime will increase by a factor of 2 and the light efficiency brightness will increase by more than 15%.
5.) LED street light system reliability, durability, environmental performance test indicators:
General product design does not take into account the dust protection system. It is necessary to completely prevent dust storms and gravity dust from accumulating in the surface-facing heat dissipation structure, resulting in the heat accumulation not being able to diverge, the LED light decay and the fatal problem of overheating and burning. The company can be designed to solve the problem with the heat dissipation structure facing the ground. It must work normally for a long time at a high temperature of 60 °C in the desert. Other anti-salt fog tests, etc., after an outdoor test time of 15000 Hr., the light decay <10% good condition. The optical design of the main road lighting has reached the world national standard. The 10-meter high pole must illuminate the banner 40 meters long on average to solve the difficult optical lens design and achieve the aspect ratio of 1:4.
The core wick technology module is light and light, and does not need to rely on the lamp housing as a heat sink. Therefore, the external design of the lamp can be arbitrarily changed in shape to achieve the aesthetic characteristics of each city.
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