#1158 6V positive or negative ground vehicles. Up to 200 Lumen output. Long life up to 30,000 hours. Dual filament one filament for low beam and one filament for hi beam. BA15D base has two contacts and the bayonets are parallel to each other. This bulb is dim-able using a variable voltage supply. Since dim-able works great in vintage and classic vehicles that the electrical system is not full voltage. White 6000 K, Warm White 3000 K, Red 625 nm, Green 526 nm, Blue 464 nm & Yellow 594 nm.