Along with LED energy savings and functionality, their safety for user and environment should be mentioned. There is no fragile glass envelope to break, no high touch temperatures; LEDs contain no hazardous materials, such as mercury. Small LED size enables versatile design of the lighting unit. LED lighting systems can be config ured to emit very high light fluxes, but even at the high light intensities, LED units can be placed close to plants, as they do not emit radiant heat. Because they are solid-state devices, LEDs are easily integrated into digital control systems(Morrow 2008) facilitating complex lighting program like varying intensity or spectral composition over a course of photoperiod or with plant developmental stage(eh and Chung 2009). However,overall LED efficiency and applications depend not only on the semiconductor itself but also on the general design and technological properties lighting system. A properly designed LED is capable of providing performance and lifetime well beyond traditionallighting source(Bourget 2008). However, when used as sole sources for pho tosynthetic photomorphogenic, and/or photoperiod lighting, narrow spectrum LEDs must be proportioned care- obtain desired plant responses