 White light emitting diodes, LEDS, have matched the emission efficiency of fluorescent lights and will rapidly spread as light source for homes and offices in the next 5 to 10 years. LEDS provide a light element having a semiconductor light emitting layer, blue or near ultraviolet, LEDS, and photo luminescence phosphorus. This article was authored by Chow and Yeh, Ruxer Lu, Chen Che-lin and others.