9004 LED Headlight 9 to 40 Volts No Polarity. Works either positive ground or negative ground. Long life up to 30,000 hours. Up to 2100 Lumens for the high beam. Up to 2100 Lumens for the low beam. Up to 23 watts for the low beam. Up to 23 watts for the high beam. Uses about 1.91 Amps at 12 Volts either low or high beam. Comparable to a 180 to 190 Watt incandescent bulb. Available in White 6000K. This bulb is not dimmable due to the wide voltage. The starting voltage is 8 volts to about 11.5 volts, once 12 volts full brightness. Actual usage is about 1.98Amps@12Volts. Wide voltage of 9 to 40 volts. Maximum voltage is 45 volts. The led bulbs have no polarity. The headlight has a built in fan to keep the led's cooler so they last longer. These led bulbs do not have load equalization built in, load equalizers may be required. Comes two bulbs per package.