1158 Led Miniature Bulb ba15d base led bulb. 12 Volt. Has 30 5730 high output leds. Up to 650 Lumen output. The ba15d base is 15mm diameter, bayonets same height and has two contacts on the bottom. The bulb is considered a dual filament bulb. One filament is low beam and one filament is high beam. The leds are aligned for maximum led light aligned with the reflector. This bulb is smaller than the original light bulb so you should not have any installation issues. Long life up to 30,000 hours. Dim-able using a variable voltage supply such as your dashboard dimmer. This led lamp is non polarity so it will operate in both positive ground or negative ground cars, trucks and cycles.