Street lights need to be turned on every day, an […]
Street lights need to be turned on every day, and the lighting time is relatively long. If the quality is not too hard, not only the people are not satisfied, but the management and maintenance of street lights is also a big task, so the lighting rate of street lights is one of the key indicators. . Then the following key links should be grasped at the beginning of street lamp procurement.
Procurement link
The first step is the light decay test report when purchasing, which is a very important link. At the time of bidding, each company will provide light decay test reports from different units. Some provide self-inspection by their own company, and some third-party inspections. Although the test results in this report are good, the actual light decay gap is huge. The reason is Everyone knows it, so how can we discern the authenticity with insight?
LED street light
First of all, the test report is a designated organization recognized by the Semiconductor Alliance. For example, the Beijing Electric Light Source Quality Supervision and Inspection Center, Shanghai Electric Light Source Quality Supervision and Inspection Center, and the 13th Institute of Semiconductors, etc., the light decay of the test reports from these units is credible. The street lamps used for road lighting have high power and generate large amounts of heat. Two problems are explained through the light decay detection: the light decay is qualified, and the power supply is off. If a street lamp cannot pass the test in the laboratory, can the quality be guaranteed if it is still on the road?
Street lamp structure
After passing the light fading test, the structure becomes a big problem. This problem is rarely paid attention to in the industry, and it is also one of the main reasons for the large light attenuation when street lamps are actually used.
Everyone knows that the smog area across the country is so large that it not only harms people, but also causes severe degradation of street lights. Especially in northern areas, where there is a lot of dust and smog, after a short period of outdoor use, the entire street lamp surface Dust covered, its heat dissipation effect is greatly reduced. This is also one of the main culprits that LED street lights are not known to everyone.
According to this situation, the lighting design must be transparent from top to bottom. Increase the heat dissipation area exponentially, because no street lamp management department will clean the radiator on time. In long-term use, it can only be washed by rain. After the area is increased, it will retain sufficient effective heat dissipation area due to pollution.
Light source part
Street light decay has a barrel effect, and there is a short board. The light decay has troubled everyone for so many years. The problem here is that you can solve the luminous decay by making the lamp radiator well. No, everyone started to discuss it in the past. Using low-power chip shell-type packaging, but high-power chips can not be used, said that the chip power is high, the heat cannot be dissipated, which is not the case, the COB package heat is more concentrated, and the aluminum bracket or copper bracket can completely solve the heat conduction problem.
But light decay is more difficult to control. The reason is that the good solution of the radiator may not solve the problem of light decay of the light source. There is a big misunderstanding in light source packaging. The COB light source silica gel is too thick, and the thinner the silicone encapsulation is better, which is convenient for the chip. The light-emitting surface dissipates heat, which is why the light attenuation of the COB light source is not well controlled.
https://www.changlux.com/
