countries actively promote the implementation of energy-saving emission reduction projects, in particular, china's led lights due to large business opportunities and led streetlight manufacturers are ＆#118alued. street lamps are an important part of urban lighting. traditional street lamps often use high-pressure sodium lamps. the disadvantages of low pressure efficiency of high-pressure sodium lamps cause huge waste of energy. therefore, development of new types, high efficiency, energy saving, long life, high color rendering index, and environmental protection the street lights have a very important significance for energy saving in urban lighting.
led street lamp features today:
the difference between high-power led street lamps and conventional high-pressure sodium lamps is that the light source of high-power led street lamps is a low-voltage dc power supply, a high-efficiency white light diode composed of a gan-based power blue led and a yellow phosphor, and a light emitting diode (light emitting diode). led) is an efficient solid-state light source based on the formation of a semiconductor pn junction that emits light with weak electric energy. under a certain forward bias voltage and injection current, holes injected into the p region and electrons injected into the n region are diffused to after the source area is irradiated and compounded to emit photons, the electrical energy is directly converted into light energy.
as a light source for street lamps, leds have many advantages over traditional street light sources.
1. the led street light has the directivity of light, and there is no diffusion of light to ensure the light efficiency;
2. the led street lamp has a unique secondary optical design that illuminates the led street light to the desired lighting area, that is, the road surface, further improving the light efficiency and achieving the purpose of energy saving;
3, led light source efficiency has reached 100lm / w, but there is still a lot of room for development, the theoretical ＆#118alue can reach 250lm / w. and high-pressure sodium lamp light-emitting efficiency is only increased with the increase in power, therefore, the overall efficiency led street lamp is stronger than 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 or so, and led street lamp color rendering index can reach 75 or more, from the perspective of visual psychology, to achieve the same brightness, led street light can average the illumination it is more than 20% lower than high-pressure sodium lamps (refer to british road lighting standards); moreover, at the intermediate vision level, human eyes can identify things more easily in a high color temperature environment than in a low color temperature environment, avoiding the occurrence of certain dangerous states;
5, led street light declines light, one year's light decline is less than 3%, use 10 years still reach the road to use the illumination requirement, therefore, the led street lamp uses the power the design may be lower than the high pressure sodium lamp;
6, led street lights can be automatically dimmed, can meet the lighting requirements in different periods, the maximum possible reduction in power, save energy;
7, led is a low-voltage dc device, driving a single led voltage is a safe voltage, so it is a more secure than the use of high-voltage power supply, especially for public places. the characteristics of dc make led particularly suitable for combination with solar energy and wind power;
8, each unit led die is only a small size, so it can be prepared into a variety of shapes of the device, and suitable for variable, easy-to-vibration environment;
9, long life: theoretical life can use more than 50,000 hours;
10, led can be frequently switched without worrying about its damage;
11、easy to install: directly install the led lamp base to the lamp post to replace the original sodium lamp holder