As a light source for street lamps, LEDs have many advantages over traditional Street Light sources. First, the LED is a semiconductor diode that has a very long lifetime. When the luminous flux is attenuated to 80%, its lifetime reaches 25,000 hours. The life of the metal halide lamp is 6000~12000 hours, and the life of the high pressure sodium lamp is 12000 hours. Second, the basic structure of the LED is an electroluminescent semiconductor material, placed on a leaded shelf, and then sealed with epoxy resin to protect the internal core wire, so the LED has good seismic performance. Third, the light color of white LEDs is better than that of high pressure sodium lamps. At the intermediate visual level, the human eye is more likely to distinguish things in a high color temperature environment than in a low color temperature environment. The color rendering of white LEDs is also much better than that of high-pressure sodium lamps. The color rendering index of high-pressure sodium lamps is only 20 right and left, while white LEDs can reach 65-80. Fourth, the LED can achieve a perfect dimming function. Since the working range of the LED is large, its light output is proportional to the operating current, so the current can be reduced by dimming. In addition, since the LED is not frequently damaged by frequent switching, the dimming of the LED can also be obtained by the pulse width adjustment method, and the luminous intensity of the LED can be effectively adjusted by adjusting the duty ratio of the voltage and the operating frequency. Fifth, in the optical system of the luminaire, the luminous flux loss of the Led Light source is different from that of the conventional light source, and the LED is a half-space illuminating light source. A high-pressure sodium lamp or a metal halide lamp is a light source that emits light in a full space, and it is necessary to change the outgoing light of one half space into the other half space by changing the direction of 180°. When we rely on the reflector to complete, the absorption of light by the reflector and the blocking of the light source itself are unavoidable. The use of LEDs as a light source does not have this loss, and the utilization of light is higher than that of conventional light sources. Finally, LED light sources do not contain harmful metallic mercury, unlike high-pressure sodium lamps or metal halide lamps that are hazardous to the environment at the time of disposal.
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