(1) Radiator is used for LED street lamp, but the design of LED connection terminal and radiator can not meet the requirements of GB7000.5/IEC6598-2-3 standard.
(2) The general road lighting shell is used, and the lighting surface of the lamps is matrix LED. Although this design can meet the IP test, the temperature of the lamp will rise due to insufficient ventilation inside the lamp. In the range of 50 80 C, under such high conditions, the luminous efficiency of the LED will not be very high, and the service life of the LED will be greatly reduced. In fact, there are obvious unreasonable conditions.
(3) Instrument fans are used to distribute heat sinks in LED and light bulbs. The air intake is designed under the lamp to avoid rainwater entering. The socket is designed around the LED light source. It can also effectively prevent rainwater from entering. In addition, the radiator and the LED (light source cavity) are not in the same cavity. This design is very good and can pass the IP test requirements of lamps smoothly. This solution not only solves the heat dissipation problem of LED, but also meets the requirements of IP level. But this seemingly good design is obviously unreasonable in practice. Because when most street lamps are used in China, the amount of dust in the air is very large, sometimes even to a large extent (such as sandstorms).