In today's increasingly energy-intensive environment, energy conservation is the responsibility of each of us. In response to the call for energy conservation and emission reduction, many street lamp manufacturers have replaced traditional high-pressure sodium lamps with more energy-efficient LED street lamps in urban street lighting renovation projects. However, the quality level of LED street lamps on the market is currently uneven. In many places, LED street lights will appear bright. The root cause of this phenomenon is that the LED street lamp has poor heat dissipation performance. When the heat dissipation performance is poor, the internal temperature of the LED lamp will be too high. When the LED temperature rises, its junction resistance decreases, resulting in a decrease in the turn-on voltage. Under the same voltage conditions, the internal temperature rise of the LED lamp will increase the LED current. The increase in current causes the temperature to rise further, which causes the bad cycle to burn the LED chip. Moreover, the internal temperature of the LED street lamp is too high, which also causes the light decay of the LED chip to be intensified, so that it will lead to a bright and not bright phenomenon in the near future. So what is the reason for the poor heat dissipation performance of LED street lamps?
First, the quality of LED street lights themselves
The LED chip used has poor thermal conductivity, and the temperature of the LED die is not transmitted to the surface (internal heat and cold). Even if a heat sink is added, the internal heat cannot be completely dissipated, and then the LED street lamp is not internally heated. .
Second, the temperature rise caused by the LED street light power supply
LED street light power quality is not good. When the LED is turned on, the non-linearity of the power supply and the weak change of the power supply will cause the current through the LED chip to increase, which will cause the internal temperature to be too high, which will affect the heat dissipation performance of the LED street lamp.
In summary, the main reason for the poor heat dissipation performance of LED street lamps is the quality of the LED chips and the driving power supply. Therefore, for our purchasers, when purchasing LED street lamps, we must emphasize the selection of high-quality LED chips and power supplies with street lamp manufacturers, and we cannot afford to be cheap. After all, high-quality products will not be very cheap. If it is very cheap, then There is a problem