General Specs: 93% Optical Efficiency Shockproof No Vibration 20 LED's with 50,000+ Hour Life Span Easy Two Wire Installation 2.89 Amps 39 watts 3600 Lumens Patented Hybrid Technology runs lights at 90% efficiency which is unmatched in the industry. Dimensions: 3.375" High 3.625" Deep 11 3/8" Long Why LED? A light-emitting-diode (LED) is a semiconductor diode that emits light when an electrical current is applied in the forward direction of the device, as in the simple LED circuit. The effect is a form of electroluminescence where incoherent and narow-spectrum light is emitted from the P-N junction in a solid state material. Advantages of LED lighting: 50,000 hour life expectancy Very High Lumens per Watt No glass lens to break No Bulbs to Burn out No Ballast to Mount Rigid Industries Advantage,it's all in the reflector. Patented Super Efficient Reflector 93% efficient vs. 72% "Brand X" reflectors Available in both Pencil and Flood Beam More Light with Less Power, Heat and size. Much Father Projection Multi Source Light No "bouncing" beams Virtually eliminates HID vibration If one LED fails the other LEDs will not Greatly Reduces eye fatigue