In 1879, Edison invented incandescent lamps, which changes the history of People. Then halogen lamps, fluorescent lamps, CFLs, HID Lamps, now led street lights china new generation.
In 1962, GE invented the first Red LED, but it was only 0.1lm/w. In 70’s, Green, Yellow, Orange LEDs were invented, the lumen is up to 1 lm/w. In 80’s, new material GaAlAs was invented, then reach 10lm/w. In 1993, the led industry went into a new generation–LED Lamps for signal application.
Now, as the LED could start in low voltage, it’s suitable to use LED to replace the HID lamps in Public lighting application, especially none-people public zones, such as LED Street Lights China. Also, the CRI of HID lamps are not good, and CRI of LED Street Lights could be higher than 80, it’s very important for the traffic safety.
In the past times, Street Lights are regarded as the most important lighting applications, now, the power cost in Western countries are higher and higher, the governments are thinking over how to balance the safety and energy saving, then the Induction street lights were invented. They are installed with IR sensors, whenever the cars or people pass by, the lumen output would be 100%, after they gone, it would be reduced to 30%-50%. But the HID lamps are very difficult to be dimmable, on the other hand, LED high bay could be dimmable and start very quickly. After we slove the problem of led street lights china heat sink, the lifespan and light loss could be better, then the LED Street Lights could be a new generation of Lightings.