Pilot for pre war headlights, stop light or tail light bulbs 6 volt / 12v , approx 21W, very bright white light 6500K, Ba15s base, (single filament), parallel pins small glass equivalent (19mm max width, 35 mm max height). Polartiy insensitive so it operates on negative or positive earth. Power consumption 6V: 0.22A. (A normal 21Watt bulb uses 3.5A )