H4 p43t led headlight forward firing. Operates either positive ground or negative ground. Up to 1,500 Lumens for the high beam, up to 1200 Lumens for the low beam. Works with wide range of voltage from 6 to 30 volts. The bulb has full brightness from 5.7 volts to 30 volts for both the low beam or the high beam. The bulb is dual filament has both a low beam and a high beam. The bulb uses a focused beam that is forward firing so you do not have to use your old reflector. Available in White 6000K or Warm White 3000K. If the color attribute is not shown it means that we are out of stock of that color and takes 4 to 8 weeks to restock that color. The White 6000K low beam uses about 0.186 amps at 30.08 volts or approximately 5.594 watts. The White 6000K low beam uses about 0.875 amps at 6.03 volts or approximately 5.276 watts. The White 6000K high beam uses about 0.865 at 6.02 volts or approximately 5.212 watts. The White 6000K high beam color uses about 0.188 amps at 30.08 volts or approximately 5.655 watts. The Warm White 3000K color low beam uses 0.919 amps at 6.02 volts or approximately 5.532 watts. The Warm White color low beam uses 0.194 amps at 30.08 volts or approximately 5.835 watts. The Warm White 3000K high beam uses about 0.203 amps at 30.08 volts or approximately 6.106 watts. The Warm White color high beam uses about 0.867 amps at 6.02 volts or approximately 5.221 watts. The metal heat sink enclosure works good to keep the led's cooler so they last longer. The bulb comes with a Alan wrench to you can adjust the focused beam due to how your fixture socket is orientated. The led bulbs do not have built in load equalizers and may require external load equalizers. Symptoms requiring load equalizers are either the headlight bulb will flicker or unable to change from low beam to high beam. The diameter is approximately 1.06". The disc is 43mm with 3 claws or tabs. The length is approximately 2.51". Comparable to a 55 Watt incandescent bulb. Each bulb is tested before shipping. Comes 1 bulb per package.