High-power LED street lamp cooling technology

According to luminous flux (lumens) and the radiant flux (watts) the following equivalent relations: where, Km = 683 lm / w, is the luminous flux of the scale, the scale is the radiant flux. 1W of radiant flux that is the case in the best (blackbody radiation) may have 683lm luminous flux. So, even if the LED light efficiency to 200lm / w, nor can all the energy into light output, while the rest is converted into heat. LED lamp heat problem in the long run will be a long-term problem.

LED street lamp current cooling methods are: natural convection cooling, install a fan forced cooling, heat pipes and loop heat pipe cooling and so on. Install a fan forced cooling mode system complexity, low reliability, heat pipes and loop heat pipe cooling means high cost. And outdoor use at night with lights, heat, and body surface in the side of the above restrictions, which are less conducive to the advantage of natural convection of air, so the LED lights as options recommended way of natural convection.

Thermal design problems may exist:
1. Cooling fin area is arbitrarily set.

2. Cooling fin unreasonable layout, lighting layout of cooling fins do not take into account the lighting is used, the effect of the fin to play.

3. Stressed the heat conduction part of the neglect of heat convection part, although many of the manufacturers to consider a variety of measures: heat pipes, loop heat pipes, add thermal grease, etc., but did not realize that heat will eventually have to rely on the appearance of an area of ​​scattered light go.
4. Ignore the heat of the balance, if serious non-uniform fin temperature distribution, will result in part of the fin (the lower part of the temperature) is not functioning or the role is very limited.
LED lights are now cooling technologies, commonly used for the thermal conductivity of multi-board arrangements, a 5mm thick copper plate is, in fact, be regarded as uniform temperature plate, average temperature of the heat off; also installed heat sink to heat, but the weight is too large. Street light system weight is very important because there are 9 meters high street, if too much risk to increase, especially if typhoons, earthquakes may produce unexpected. Perhaps in the future LED lights into the area of ​​broad, may form a modular heat LED lights will better address the difficult situation of heat dissipation.
"In fact, in our country ', the brighter the better' is the biggest misunderstanding people!" China Academy of Building Research Stem said Xiao Hui, a famous lighting expert.
Shenzhen Lighting Association, said Yin Shaohua, China's lighting behind the past 50 years than in developed countries, other countries have long out of the light source is still used today. Due to lack of professional designers, landscape lighting not only the majority of domestic saving, but also very harsh, people get tired, there is some discrepancy with the international standards.

Lighting in the high-power floodlights and street lights, through the window, lit the room brightly lit, so that residents can not sleep, the survey shows that such a good lighting environment than the general population of people seem to age some of the same age .
The more bright lights is not better! Choice when lights need to consider the environment a lot.