P15D-30 LED Headlight 12 Volt 30 SMD. Works either positive ground or negative ground. UP to 400 Lumens. The smd are positioned where the filament would be for optimal light output. The lamp is dim-able using a varying voltage source. The max voltage is 14.2. Super long life up to 30,000 hours. Made with 5730 smd for maximum output. The base diameter is 15mm. The ring is 30mm. There are two contacts. One contact is for low beam. One contact for high beam. CE and Rohs. Other names DC prefocus, double contact prefocus or double contact candelabra prefocus. The M.O.L. is 1.962" and the diameter is 0.741".