BA15S car LED lamp

BA15S LED bulb (1156, P21W, R5W): bright, efficient light with a single contact

The BA15S is a bayonet base with one contact point on the bottom, also known as 1156, P21W, R5W or R10W. Depending on the model, this bulb is used in the reversing light, brake or tail light, indicator or rear fog light of your car. Here you will find BA15S LED bulbs in daylight white (5700K to 6500K), red, yellow and orange. There are versions for 12V and for 12-24V, and some are CAN-BUS with forced cooling. All bulbs are supplied in sets of 2.

What to look for when choosing

• Light colour per function: daylight white for the reversing light, red for brake and tail lights, yellow or orange for indicators.
• Brightness: a compact bulb is enough for an R5W position; for reversing or brake lights, choose a more powerful version, such as the 10W versions with forced cooling.
• Voltage: 12V for passenger cars, the 12-24V versions also for trucks, buses or campers.
• CAN-BUS: if your car's on-board computer monitors the bulbs, preferably choose a CAN-BUS version.
• BA15S or BAY15D: the BA15S has one contact point, the BAY15D (1157) has two. They are not interchangeable.

Will it fit your car?

Remove the old bulb and look at the bottom: one contact point and two pins at the same height means BA15S. Also check the length of the LED bulb so that it fits in the reflector and behind the lens. Do you get an error message after fitting, or does the indicator flash faster? Then we recommend a suitable resistor; see our LED resistors.

Laws and regulations

If you use these bulbs in brake, tail, indicator or reversing lights, the light colour and operation must meet the legal requirements. So check in advance whether use in your vehicle is permitted.

Looking for a different base? Also take a look at the BAY15D LED bulbs, the T20 LED bulbs or all LED car lighting.

The tips on this page are non-binding advice; installation and use are at your own expense and responsibility.