Rebaydo 2 pcs H1 LED Headlight Bulbs are designed for vehicle headlight applications requiring H1 base bulbs, operating on a wide voltage range from approx. 9V–40V (max approx. 45V) and compatible with negative ground systems only. Produces 3400 lumen per pair or approx. 1700 lumens per bulb. 6000K white color temperature. Is not dimmable due to the wide voltage input, with light output comparable to a 55 to 65 watt halogen bulb. Built-in 12 mm cooling fan helps maintain optimal operating temperature, with a rated lifespan up to approx. 30000 hours. Dimensions are 1.4 inches bulb length × 2.28 inches overall length × 0.94 inches maximum diameter, with 0.45 inches × 0.26 inches bulb size and approx. 4 inches wire length.