Talking about the key indicators of high-performance LED street lamps to the lamp system

Xinyuan Sheng Technology Director Guan Xinning

The global energy and environmental crisis has led to changes in the environment. The industry is eager to learn about new ways to seek green energy and energy-saving technologies. It coincides with the rise of the LED lighting industry. A large number of technology companies have invested in this emerging industry, and the LED lighting reliability performance standards have not been set in real time. As a result of standardization, a large number of products could not pass the test to end the severe light decay. The reason was that no theoretical research was 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 technology of LED chip & package components is the breakthrough of mass production in the US and Japan. The luminous efficiency is above 100~120 lm/W, which exceeds the traditional highest efficiency HID light source (lighting efficiency 90~110 lm/W). Up to 60 lm/W, meeting road lighting life, long light decay, meeting international standard average illumination of 25~40Lux and energy saving 50~80%.

2.) LED luminous efficiency VS. Temperature rise and life specification key technical indicators:
Secondly, 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 film (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. Environmental temperature key technology pointer:
Therefore, the operating temperature of the luminaire system shall not be higher than 85-10=75°C. The specifications of the LED illuminating demonstration lamps of the Taiwan Industrial Technology Research Institute stipulate 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 ΔT≦15°C. Take the 150W LED street lamp of our company as an example. The temperature rise test of the heat transfer system is as low as ΔT≦12~15°C, and calculate the thermal resistance value Tr=0.08~0.1°C/W. The general design system temperature rise test ΔT ≒ 30 ~ 40 ° C, calculate its thermal resistance value Tr = 0.2 ~ 0.26 ° C / W, life will be shortened by 2 times and light decay of more than 15%. 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 only increases by 30~70 dollars; if you use high-end products such as computer CPU to use 10 times the active heat dissipation method of natural heat dissipation, the high efficiency military standard micro fan life guarantees 50,000 hours IP65 waterproof and dustproof level, lamps The temperature rise of the system is as low as ΔT≦12~15°C, and the temperature is reduced by more than 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:
The 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 overheating of the LEDs; we can design the heat dissipation structure to face The ground is completely solved. 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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