The description of LED light (lamp)?

LED is abbreviation of Light Emitting Diode, it is a new technology  developed the middle of the 20th century. It is direct light relies on  the electrons of semiconductor heterojunction removed by barrier energy.  The light produced by LED is luminescence process which does not  generate heat, the energy conversion efficiency is close to one hundred  percent, long service life, and the LED light is the continuous  development of lighting technology direction.

LED fine low energy street lamps principle:

Light-emitting diodes (led) core part is  composed of p-type and n-type semiconductor chips, between the p-type  and n-type semiconductor has a transition layer, called the p-n  junction. In some of the  semiconductor PN junction, the minority carrier injection compound with  majority carrier will release excess energy in the form of light, so as  to directly convert the electric energy to light energy. PN junction to add reverse voltage, and minority carrier injection, so don't shine.