The 9003 bulb is the sole bulb type specified for the Bering MD23M, covering both the high beam and low beam headlight positions across the 1999-2000 model years.
The 9003 is a dual-filament halogen bulb, meaning a single bulb unit contains two separate filaments: one rated at 60W for high beam output and one rated at 55W for low beam output.
Operating voltage for the 9003 is 12V, which is consistent with standard 12-volt automotive electrical systems.
The 9003 uses a P43t base, a bayonet-style mount with a 43mm flange that positions and locks the bulb within the headlight housing.
The 9003 designation follows the ANSI standard used in the United States and Canada, making it a North American market specification.
Because the 9003 serves both the high beam and low beam functions in the MD23M, the vehicle uses a single-bulb headlight system rather than a separate-bulb arrangement for each function.
The 9003 is functionally equivalent to the H4 bulb used in international markets, though the two designations reflect different regional standards and housings may not always be interchangeable without verification.