Rebaydo P15D-30 2231 LED Headlight 5 To 30 Volt Dual Filament Non Polarized NCNRNW. Works both positive chassis and negative chasses. The bulb is full brightness from 5 to 30 volts. 1 Row on both sides light for low beam. Both rows light for high beam. The base is P15D-30 with the two contacts rotated for 2231 bulbs. The diameter of the base is 15mm with two contacts on the bottom. The overall length of the bulb is 2.52 inches. The width of the bulb is 0.98 inches. The height of the body above the BA15D base is 1.77 inches. This bulb works great for older 6 volt vehicles. Long life up to 30,000 hours. The bulb uses 800mA for low beam and 1.4A for high beam. Load equalizers may be required if the bulb does not switch from low beam to high beam or if the light bulb flickers. Please be careful when installing in a old corroded socket. This bulb is a NCNRNW which stands for Non cancelable, Non returnable, No warranty.