LEDs may be little, but new high brightness models are producing a considerable amount of light. First used as status and indicator lamps, and more recently  in under -shelf illumination, accent lighting,and directional marking applications,  high brightness LEDS have emerged within the last six years. but only recently have they been seriously looked upon as a feasible option in general purpose lighting.Before you reccomend or install this type of lighting system, you should understand the basic technology upon which these devices are based. Light-emitting diodes (LEDs) are solid state devices that convert electric energy directly into light of single color.Because they employ 'cold' light generation technology,in which most of the energy in delivered in the visible spectrum, LEDs dot waste energy in the form of non-light producing heat. In comparison, most of the energy in an incandescent lamp is in the form of non-light producing heat .In comparison most of the energy in an incandescent light bulb is infared (or non-visible) portion of the spectrum.As a result, both flourescent and HID lamps produce a grat deal of heat.In addition to producing cold light, LEDs;
-- Can be powered from a portable battery pank or solar array.
--Can be intergrted into a control system.
--are small in size and resistant to vibration and shock
--have very fast 'on time' (60 nsec vs 10 msec for an incandescent lamp)
--Have good colour resouion and preset low, or no shock hazard.