C5W 31mm Car LED Bulb

C5W 31mm LED festoon (SV8.5): the short size for interior and number plate

C5W is a tubular bulb with a metal cap at each end, also called festoon or SV8.5. The 31 mm version is the shortest size and is often used in interior and reading lights, the boot, the glove box or the number plate light. Here you will find C5W 31mm LED bulbs in daylight white (6000K and 6500K), warm white (3000K) and blue. You can choose from filament, SMD and COB, for 12V or 24V, and there is a CAN-BUS version with heatsink. All bulbs are supplied in sets of 2.

What to look for when choosing

• Length: C5W comes in several lengths. This collection is for 31 mm; for 36, 39 or 41 mm, choose another collection.
• Light colour: warm white gives a cosy light, daylight white a fresh, bright light. Blue is intended for interior lighting.
• Technology: filament bulbs resemble the original tubular bulb in shape; with SMD and COB the LEDs sit on a small board.
• Voltage: 12V for passenger cars, 24V for trucks and buses.
• CAN-BUS: if your car's on-board computer monitors the bulbs, preferably choose the CAN-BUS version.

Will it fit your car?

Measure the old bulb from cap to cap in millimetres and choose the same length. Also check the thickness: an LED bulb with heatsink is sometimes wider than the original. Do you get a bulb warning, or does the bulb glow faintly when switched off? Then we recommend a CAN-BUS version or a suitable resistor; see our LED resistors.

Laws and regulations

If you use a C5W LED bulb in the number plate light, the light colour and operation must meet the legal requirements. So check in advance whether use in your vehicle is permitted.

Need a different length? Also take a look at the C5W 36mm LED bulbs, the C5W 39mm LED bulbs or the T10 LED bulbs.

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