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BA15s bulbs (also called P21W) are automotive bulbs with a bayonet socket and a pin. The socket has straight pins and a filament. They are mainly used as brake lights, turn signals, position lights and reversing lights in cars, campers, motorcycles and other vehicles.

You can choose between traditional halogen bulbs and modern LED bulbs with the same BA15s base. LED variants offer a longer lifespan and lower power consumption.
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