MACHANICAL SPEC: Housing:Aluminum,Plastic. Connector Type:GU5.3 Compatible. Dimension:50mmD x 50mmH. Weight:35g. ELECTRICAL SPEC: Rating:12VDC / AC 50/60 Hz. Power Consumption : 5W. ENVIRONMENTAL SPEC: Operating Temp : -20C - 40C. Storage Temp : -40C - 80C. Humidity : IP 65. Body Temp : 75C (E Temp = 20C). mtbf : .20,000 HR. OPTICAL SPEC: Beam Angle : 38 degree. Color Temp : Average 3000k +-15%(warm white). Illumiance : 500 Lux at 1 meter.(+10%).............................................. LED lamps have been advocated as the newest and best environmental lighting method. According to the Energy Saving Trust, LED lamps use only 10% power compared to a standard incandescent bulb, where compact fluorescent lamps use 20% and energy saving halogen lamps 70%. A downside is still the initial cost, which is higher than that of CFL (compact fluorescent lamps). However, when the life expectancy and other factors are incorporated, regular LED's are not more costly than CFL lamps.