Before the LED lights do not appear, and high pressure sodium lamps are giants of the road lighting, when the LED lights suddenly appear, the Giants position has become precarious, gradually rising calls for LED street light, LED street lights replaced the high pressure sodium lamp as an inevitable trend. What exactly LED Street lamp compared to high pressure sodium lamps offer it?
LED, light emitting diodes, are made with ⅲ-ⅳ-ⅵ compounds, is a solid-state semiconductor device, it can be directly converted to electric light. Heart of the LED is a semiconductor chip, semiconductor chip is composed of three parts, part of the p-type semiconductor, in the dominant position it inside the hole, and the other end is the n-type semiconductor. When current passes through the wire on the chip maker's time, electrons and holes are pushed to the quantum, electronic back together with holes in a quantum well, and will be issued in the form of photon energy, which is the principle of LED light. And the wavelength of the light is the color of the light, is decided by the formation of p-n junction of the material.