LED( low emitting diode) is a kind of luminescence power, it is a conductor device. LED can transform electric energy into the light energy directly. Merit: 1. low power and heat; 2. long service life,the aerage life span is 100,000 hours; 3. Giving out light softly, there is no direct radiation; 4. Low fault rate, its very convenient to modify; 5. Small dimension wiht efficiency light giving out. 6. Various kinds of shapes and colors for choose.