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LED bulbs with BAY15D base (P21/5W/1157) – double filament bulb for combined brake and tail light. BAY15D has two brightness levels: low light (tail light/position light) and high light (brake light). CANbus compatible variants that eliminate error codes. Red color for brake/tail light.

BAY15D (P21/5W or 1157) is a dual filament socket that combines two functions in the same bulb: low beam for tail/position light and high beam for brake light. The two pins are at different heights, which means that the bulb can only be mounted one way. This ensures that the correct filament is connected to the correct function.
BA15S (P21W) has one filament and one function – for example, brake light only or turn signal only. BAY15D has two filaments and is used where the same lamp position needs to be able to light with two different intensities. If your car has separate bulbs for brake and tail light, you need BA15S. If it has a combined brake/tail light bulb, you need BAY15D.
Questions? Contact us with car model.