[Opinion] The current secondary light distribution problem of LED street lamps

by:EME LIGHTING     2020-01-03
  China Lighting Network News (Special correspondent Hu Haifeng) For the current LED products, the status quo of the stone has been passed. From the general situation of the Canton Fair in 2008, the major enterprises have been involved in it, especially the number of small and medium enterprises has reached more than 30, they all grab In front of the big companies, they want to seize the market one step at a time. It seems that the industry has already identified the LED market. So what is the current state of LED streetlights? At present, all kinds of traditional lighting, LEDs are almost all, a wide variety, then targeted LEDs - street lights. Since the national standards for LED street lamps have not yet come out, it is only some local industry standards that can be referenced, as well as some preliminary reports on the development of industry standards by large enterprises and state agencies. Most of them are based on experience. Several problems faced in the process of making LED street lights are now explained for the secondary light distribution of LEDs. The light distribution problem of LEDs can be said to be simple and complicated. Why do you say that? because: (1) In some people's opinion, is it reasonable to use the characteristics of the LED itself to change its direction to satisfy the light uniformity and meet the light distribution of the street lamp? From the 'software' aspect, even if it can meet the uniform distribution of light, can it meet the distribution curve of existing national standard street lamps? Obviously not. From the 'hardware' point of view, it will have the consequence that the characteristics of the luminaire are relatively high, and the uniqueness of the lamp body is relatively strong. The biggest problem is to prevent glare. (2) The problem of light distribution that can be done is to use a lens. The lens can form the light distribution curve required by the street lamp, and the light can be evenly distributed. The problem is that the lens can achieve the best light transmittance of 92%. It is a theoretical value. In practical applications, it reaches 87%, and the light loss is more than 10%. For the energy saving and high luminous efficiency of LED street lamps, these data are a violation. (3) Then there is a way to use the reflector, its use should be relatively optimistic, but the cost is not cheap, it is no more than the lens market can find a variety of ready-made things, first of all professional Design, and then open the mold, resulting in relatively expensive initial investment, relatively high risk. Compared with the above situations, the need to adapt to the current development needs, or a more reasonable way to solve the problem of light distribution remains to be studied and certified. Edit: Lumens
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