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LED BA9S/T4W bulbs – small bayonet bulb used in parking lights, side indicators, instrument lighting and interior lighting. BA9S is one of the oldest automotive sockets and is still used in many European cars. Replace with LED for whiter light and longer life.
LED BA9S/T4W bulbs – small bayonet bulb used in parking lights, side indicators, instrument lighting and interior lighting. BA9S is one of the oldest automotive sockets and is still used in many European cars. Replace with LED for whiter light and longer life.

BA9S (T4W) is a miniature bayonet socket that is often found in side marker lights, interior lighting and in the dashboards of older cars. The bulb is physically small and has a simple bayonet socket with a pin notch. The LED replacement provides significantly whiter light and eliminates the yellow tone that the incandescent bulb gives.
Parking lights (side position lights) in older European cars, instrument lighting and indicator lights, door lighting and glove box lighting, reading lights in the roof of older cars. If your car has T4W bulbs in the headlight as parking lights, changing to LED provides an instant upgrade to the look.
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