The product number P-12048A, P-12048B likely refers to an aftermarket automotive halogen headlight bulb for heavy-duty commercial vehicles, such as trucks and buses. It is an H11 type bulb operating at 24V with dual wattage settings of 70W for the low beam and 100W for the high beam. The "PLASMA" designation is a marketing term used to indicate a blue-tinted coating on the bulb glass.