P15D-30 LED Headlight bulb. Works both positive chassis and negative chassis. Operates voltage from 5 to 30 Volts full brightness at any voltage in that range. This bulb is a dual filament bulb both low beam and high beam. Up to 1200 Lumens low beam and 1800 Lumens high beam. The base is a P15D-30 base with two contacts. One contact is low beam and the other contact is high beam. The diameter is 15mm for the base and 30mm for the ring with 3 holes. Available in White 5000-6000K and Warm White 2700-3300K. Dimensions are overall length is 2.52 inches. The width is 0.98 inches. The length of the body above the BA15D base is 1.77 inches. The circuit board is super conducting aluminum for maximum power supplied the the leds. The led headlamp is a constant current device so the brightness will not fluctuate. CE and Rohs listed. Made with leds on both sides so for low beam only one row on both sides is illuminated for high beam both rows of leds light up on both sides. The reason the leds light up on both sides of the led headlight is to simulate the original filament by splitting the led into to sides. Long life up to 30,000 hours. This bulb works great for 6 Volt and 8 Volt Ford's. Uses 800mA for low beam and 1.4A for high beam. This bulb will work in 6V, 8V, 12V, 24V up to 30V systems positive ground or negative ground. Easy to install just remove the old incandescent bulb and insert the new led headlamp. Since the led bulb is solid state you do not have to worry about broken glass or broken filament. This DIY job is fast less than a hour minute usually. Since there are no modification to the vehicle, truck, tractor or motorcycle. This headlight works either ac or dc. The LED wattage is 5 Watts comparable to a 35 to 45 Watt incandescent bulb. Load equalizers may be required, if the bulb will not switch from low beam to high beam or if the bulb flickers when installed. Please install led light load equalizers to fix the problem product code 65832. The reason for NCNRNW is because the ring will break when inserting into corroded or old sockets so please be careful when installing this bulb. This bulb is tested for low beam and high beam non polarized test.