MR16, GU5.3 Base, 20 super bright LEDs, LED light bulb, 60,000 hours Life Time, Green light, Wavelength=520nm, 60 lumens, equal to the output a 15W halogen lamp. Just plug it into your 12V AC or DC halogen fixture and start to save on utility bill. This LED bulb have a spotlight with 60 degree viewing angle using 20 LEDs with 15~20 degree viewing angle. The bulb is comparable of 15-20W halogen. Less Power Consumption(about 1/9 of Halogen) Only uses 180mA and gives a compared light output of a 20W style halogen, so if you comapare the power usage. 1 x 20W MR16 halogen = 1666mA, 1 x 20 LED MR16 = 180mA (light comparison to 20W halogen but no heat). DC12V or AC12V operation. Or using 12V solar panel power.