LED downlight, as known as LED recessed downlight, LED ceiling downlight,  is a light fixture that is installed into a hollow opening in a ceiling. When installed it appears to have light shining from a hole in the ceiling, concentrating the light in a downward direction with as a broad floodlight or narrow spotlight. Because of LED downlight is a great lighting product can create perfect lights indoor, LED downlight becomes one of the most popular LED lighting products. It is widely applied in many places, include hotels, shopping malls, offices, restaurants, commercial places and residential places,etc.