Currently, the quantity of the light market is ten billion all over the world, and one third of them are the energy-saving lamp. This kind of light will develop quickly in the future three years; then the growth will stop after the year of 2015. The obstacle of cost is still exhausted in the LED industry, but the cost of LED light is reducing quickly. It is predicated that the LED light, which is in the experimental stages now, will be the main stream in future five to ten years. The LED solid-state lighting is regarded as the first choice of the high-efficiency illumination, because the performance is ten times of the incandescent lamp. Currently, the LED is used in some special application, such as the illumination for building and decoration. In order to make it the main stream of interior lighting, manufacturers are making further effort on the brightness, efficiency and cost.
Two reasons make the price of LED high, one is the high cost of LED light source, and the other is the high cost of radiating metallic shells. Beside, the short life of the aluminum electrolytic capacitor makes the service life of the LED driving supply short. The temperature in the light is very high, so the electrolyte will be consumed quickly. It is able to work for five thousand hours. Some providers have invented the LED light without driving supply to solve the problem, but many experts do not agree with this invention, because many standards can not be passed without this device, such as the EMI test and the flicker-free test.
On the architecture point of view, the non isolation type is the main stream in Japan and America, because their input voltage is only 110V, while China and Europe make the isolation type as the mainstream, because their input voltage is 220V. The cost of the isolation type is comparatively high. The related integrated circuit is 595D .
