The FTD/R is a 12 Volt - 20 watt 36 degree flood in Red with a G4 bi-pin base. These MR-11 halogen light bulbs are used in general lighting applications as well as some fiber-optic lighting but mainly track lighting, cabinet lighting and landscape lighting. The MR-11 is 1-3/8 inch in diameter. This halogen bulb has a red cover glass.