In actual application, the problems of high power LED in the following areas:
1 to ensure LED working conditions and lack of technical power level of knowledge, resulting in product failure on the power after another.
2 on the road of practical application of concepts in today's LED Blue 150W street is unclear, the blind and the high-power gas discharge lamps, "comparable" regardless of the cost of the production of ultra-high-power LED street lamp, resulting in not in conformity with the actual expensive lights difficult to promote.
3 road lighting requirements of a lack of perception and scientific point light source optical light distribution difficulties and ignore the importance of the color temperature in the road lighting, easy to cause glare, zebra effect and with serious air pollution, rain, fog environment cause not bright enough light on the ground phenomenon.
Road lighting requirements vague, the actual use of the maintenance of the ill-considered, resulting in the boycott of the owners.
Requirements do not quite understand the working conditions of the LED light source caused by light attenuation serious and even death to light.
Discussion of this issue on the LED 200W light source of the work environment, need to have basic knowledge to understand the LED; light-emitting diodes of the core of the PN junction. It has IN general PN junction characteristics, the forward pass, reverse cut-off, breakdown characteristics. In addition, under certain conditions, it also has optical properties. Forward voltage, the electron from the N region into the P region, and holes from the P region into the N region. Into the other region of minority carriers (minority) part with the majority carrier (multiple) composite and shine, today's high-power LED luminous efficiency of about 30%, 70% will be the heat, to heat treatment. High-power white LED strip lights junction temperature TJ brightness decay by 70% and the relationship between life can be seen: TJ = 50 ° C, the life expectancy of 90,000 hours, TJ = 80 ° C, the life is reduced to 34,000 hours, TJ = 115 ° C , the life span of only 13,300 hours. TJ in the thermal design to make the maximum allowable junction temperature value TJmax is, the actual value of the junction temperature TJ should be less than or equal to the requirements of TJmax is that the TJ to ≤ TJmax is.
Called attention to the degree of cooling the thermal balance of speed, resulting in the heat of the light source is not effective treatment caused by light attenuation serious. Now many manufacturers of high-power LED heat sink cooling shell application the basic use of different aluminum alloy material, the different thermal conductivity, the cooling rate of some materials can not meet the LED working conditions. The aluminum plate can not be ignored and thermal silica, silicone grease thermal conductivity link, the actual life quality of the materials used will directly affect the LED 400W heat dissipation. How to reduce intermediate links, direct close contact with the heat sink cooling the effective cooling of the heat fast to reach equilibrium, is the need to consider the direction of today's high-quality LED lighting product development.