China LED lamp technology development status and problem analysis

   Countries to actively promote the implementation of energy saving projects, especially for business opportunities in China's large LED lamp LED lamp manufacturers have been affected by attention. Street lighting is an important part of the city, often using traditional high pressure sodium lamps, high pressure sodium and low overall polishing efficiency shortcomings caused a huge waste of energy, so the development of new high efficiency, energy saving, long life, high color rendering index, environmental protection The energy-saving street lighting with the city of great significance.

    Characteristics of today's LED lights:

    High-power LED lights with conventional high pressure sodium lamps is different is that high-power LED street lamp light low voltage DC power supply, the power-type GaN-based blue LED and yellow phosphor synthesis of efficient white light LED, LED (Light Emitting Diode, abbreviated as LED) is based on the semiconductor PN junction formed with the weak energy efficient light-emitting solid-state light source can, in a certain forward bias voltage and injection current, the injection into the P region of the hole and electron diffusion region N active zone to be issued by the radiative recombination photons, the energy directly into light.

    LED as a light source lamp, the traditional street light it and there are many more advantages.

    1, LED street light point of itself, does not diffuse light, to ensure that the light effect;

    2, LED lights have a unique optical design of the second, the LED street lighting required for the light shines on the area that the road to further improve the light efficiency, save energy;

    3, LED light source efficiency of the current has reached 100lm / W, but there is still much room for development, the theoretical ＆#118alue can reach 250lm / W. The luminous efficiency is high pressure sodium lamp with the power increase have increased, so the overall light efficiency stronger than the high-pressure sodium lamp LED lights;

    4, LED street light color than the high-pressure sodium lamp high pressure sodium color index is only 23, while LED lights color rendering index can reach 75 or more, from the visual psychological point of view, to achieve the same brightness, LED street illumination average of lower than 20% of high-pressure sodium lamps (the United Kingdom road lighting standards); and, in the middle of the visual level, the human eye than in the high color temperature environments with low color temperature is easier to identify things in the environment, to avoid the occurrence of certain dangerous condition;

    5, LED street light is small, light-year decline of less than 3%, with 10 years still to illumination requirements for road use, therefore, LED street lamp design in the use of power can be lower than the high-pressure sodium lamp;

    6, LED lights can be automatically dimming, can achieve to meet the lighting requirements at different times, the maximum possible reduction in power, saving energy;

    7, LED is low voltage DC devices to drive a single LED voltage for safety voltage, so it is a more secure than the use of high voltage power supply, especially for public places. DC characteristics of the LED and particularly suitable for solar energy, wind power to combine;

    8, only a small LED die each unit volume, it can be prepared into various shapes of the device, and for variable, easy to shock the environment;

    9, long life: life expectancy theory can be used more than 50,000 hours;

    10, LED can be frequently without worrying about the damage to the switch;

    11, easy to install: LED street lamp directly mounted on poles to replace the original sodium lamp