Countries actively promote the implementation of energy-saving and emission reduction projects. In particular, China's LED street lamps have been valued by LED street lamp manufacturers due to their huge business opportunities. Street lamps are an important part of urban lighting. Traditional street lamps often use high-pressure sodium lamps. The low-efficiency of high-pressure sodium lamps as a whole has caused huge waste of energy. Therefore, it develops new high-efficiency, energy-saving, long life, high color rendering index and environmental protection. Street lights are of great significance for urban lighting energy conservation. Today's LED street lights features: The high-power LED street lamp is different from the conventional high-pressure sodium lamp street lamp. The high-power LED street lamp uses a low-voltage DC power supply, a high-efficiency white light diode synthesized by a GaN-based power type blue LED and a yellow phosphor, and a light emitting diode (LightEmittingDiode, abbreviated as LED). It is a high-efficiency solid-state light source based on a semiconductor PN junction that emits light with weak electrical energy. Under a certain forward bias voltage and injection current, the holes injected into the P region and the electrons injected into the N region diffuse into the active region. After the radiation is combined to emit photons, the electric energy is directly converted into light energy. LEDs are the source of street lights, and they have many advantages over traditional street light sources. 1. The LED street lamp itself has directivity of light, and there is no diffusion of light to ensure light efficiency; 2. The LED street lamp has a unique secondary optical design, and the light of the LED street lamp is irradiated to the area of ​​the required illumination, that is, the road surface, thereby further improving the illumination efficiency and achieving the purpose of energy saving; 3, LED light source efficiency has reached 100lm / W, and there is still a lot of room for development, the theoretical value can reach 250lm / W. The luminous efficiency of the high-pressure sodium lamp increases with the increase of power. Therefore, the overall luminous efficacy LED street lamp is stronger than the high-pressure sodium lamp; 4, LED street light color rendering is higher than high-pressure sodium lamp, high-pressure sodium lamp color rendering index is only 23, and LED street lamp color rendering index can reach more than 75, from the visual psychological point of view, to achieve the same brightness, LED street light illuminance average It is more than 20% lower than that of high-pressure sodium lamps (refer to British road lighting standards); moreover, 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, avoiding certain dangerous states; 5, LED street light's light decay is small, the light decay of less than 3% in one year, still meets the road use illumination requirement after 10 years of use. Therefore, the design of LED street light in use power can be lower than that of high pressure sodium lamp; 6, LED street lights can be automatically dimmed, can achieve the lighting requirements in different time periods, the maximum possible power reduction, save energy; 7. The LED is a low-voltage DC device that drives the voltage of a single LED to be a safe voltage, so it is a safer power source than a high-voltage power supply, and is especially suitable for use in public places. The characteristics of DC make LED suitable for combination with solar energy and wind power; 8. Each unit LED die has a small volume, so it can be fabricated into various shapes of devices, and is suitable for a volatile and irritating environment; Fiber Attenuator ,generating a adjustable Loss to the fiber optic link,are used to control the power level of optical signals at the outputs of light sources and electrical-to-optical (E/O) converters. Fiber Attenuators use several methods of attenuation,including air gaps, micro-bends, acoustic-optic modulators, and electro-optic modulators.The attenuation range is from 1dB to 30dB.Meanwhile,They are high attenuation accuracy and working temperature from -40 C to +75 C.Series of Fiber Optic Attenuator include Variable Optical Attenuator,Inline Optical Attenuator and Fixed Optical Attenuator.They are compatible with the fiber optic products currently available in the international market.Foclink,a reliable supplier of fiber attenuator,is always beside u 7*24. Fiber Attenuator Fiber Optic Attenuator,Optical Attenuator,Fiber Attenuators Foclink Co., Ltd , http://www.scfiberpigtail.com