Instead of a stock 12 volt headlight bulb that uses T19 marking this bulb is designed with almost no power draw and puts out 30 watts. 12v 30/30 dual filament headlight bulb gives you a brighter beam without chainging the look of your bulb. Treat your whole collection to a bulb that can give you the brightest beam. Stock up on correct bulb with working low-beam and hi-beam! Perfect choice when doing a 12 volt conversion ignition.