6v h4 male base dual filament headlight. Up to 900 Lumen output or 60 to 70 CP candle power. This bulb is dim-able so as your voltage in your old system is not putting out 6 volts these headlamps will still stay on dimmer. The life is long up to 30,000 hours. CE and Rohs listed. The side firing leds are optically aligned with your reflector for maximum light output out of your lens. The light comes in two colors white 6000K and warm white 3000K. The led lamp is designed to to be smaller than your current light bulb so you do not have to worry about installation issues. There are 16 forward firing and 44 side firing 5730 smd leds. Each 5730 smd can output up to 1/2 watt of power. Since these led bulbs are not polarity sensitive they will work in both positive ground and negative ground. Extend warranty, please see detail page for more information. Dim-able with variable voltage. Maximum overall length is 1.944 inches. The maximum diameter is .760 inches. Great for classic and vintage older vehicles that have 6 volt positive or negative ground voltage systems.