The Application Problems of LED Lights

　　Presently, China LED lighting industry is entering the major historical opportunity of independent innovation and achieving leapfrog development. The application of LED light continues to expand, but there are some problems in the practical application. The whole country has become the testing ground of LED lights. Some products have no technology content and are in low-level redundant development. There are some problems to be solved in the application of LED light.

　　1. High price

　　Currently the cost of LED lights is much higher than the cost of high-pressure sodium lamps. The unit price of LED street light is about 3,000 to 5,000 RMB, or even higher. While the price for a set of imported brand high-pressure sodium (including lamps and complete set of electrical appliance) does not exceed 1,500 RMB. In their current state, LED lights are clearly too expensive, which is 2-5 times higher than pressure sodium lamp. Therefore, even if the power consumption of LED light is half of the high pressure sodium lamp, because of the high price, the cost recovery period of replacing the high pressure sodium lamps with LED lights will still be very long.

　　Therefore, price and cost is still the biggest obstacle on the promotion road of LED lights in lighting market. To lower down the price of LED street lamps to compete with the existing lightings requires the manufacturers to reduce the costs. But in the near future, it can only make up the price disadvantage with longer lifespan and more energy saving on the premises of the maturing technology and increasing luminous efficiency.

　　2. Domestic light source could not meet the market demands

　　The development of domestic LED light source has a relatively late start and there is a certain distance on the technical level from the international industry leader. Currently, the light efficiency of Cree, Nichia, Osram and other imported light sources is generally more than 100lm / W. Although China has been increasing the investment on the development of the LED light source technology and the skill levels are rising, the light efficiency is still on the development process from 30lm / W to 60lm / W and then to 100lm / W. Whether from quality or from quantity, the domestic LED light source is far from being able to meet the market demands.

　　Although the theoretical life of domestic LED light source PN junction works at room temperature can reach 100,000 hours, due to the cooling problems could not be effectively solved, the practical lifespan is greatly reduced. The light failure of LED street light (lifetime) has also become one of the key issues restricting the wide application of LED street lamps. Currently there is no service experience of the lifespan of LED lamp. Many domestic LED manufacturers claim the lifespan of LED light source could reach 5 ~ 60,000 hours, but no actual data or the laboratory test data to support the practical application lifespan. In the practical use, some product occurs a lot of “dead light” in a short time because the large light failure, thus causing serious injury on the reputation of LED lights.