This is the Tungsten Halogen Capsylite light bulb. It has a Par36 Screw terminal and a spade connector base. It uses 20W 12V, also has a wide flood beam angle of 27 degrees. It uses 36 watts for the 500 lumens of brightness. This bulb has a lifespan of 4000 hours or 3.7 years at 3 hours a day. Main uses are in landscape or pool fixtures, but mainly for indoor or outdoor use because of the 3000K warm white light.