How Many Bulbs Does Your Car Actually Have

Interior LED kits are sold by piece count. Six, ten, fourteen, twenty-one. Buy too few and you run out halfway through the job. Buy too many and you pay for bulbs that sit in a drawer.

Counting them yourself takes about five minutes and saves a wasted order.

Where interior bulbs hide

Work through the car with the interior lights on and write down each one. Most cars have bulbs in these places:

• Dome or centre light — one, sometimes two.
• Map or reading lights — one per seat position, so two to four in the front, and often two in the back.
• Vanity mirrors — one or two per sun visor. Easy to forget.
• Glovebox — almost always one.
• Footwell — front pair, sometimes rear as well.
• Boot or trunk — one, occasionally two.
• Door puddle and courtesy lights — one per door on cars that have them.
• Makeup or ambient strips — a handful of small ones on newer premium cars.

Open the tailgate, open the glovebox, flick both visors down and look up at the rear headliner. Those four spots are where most people miss bulbs.

Why piece counts differ

A four-door sedan with a sunroof and no footwell lighting might need eight bulbs. A long-wheelbase SUV with rear reading lights, four footwells and door courtesy lights can need more than twenty. Same era, same brand, very different kits.

Trim level matters as much as body style. A base model and a top trim of the same car often have different interior lighting, so a kit listed for the model may not match your specific car. If the seller asks for your trim or your chassis code before shipping, that is a good sign.

Note the bulb type, not just the count

Two cars can need the same number of bulbs and still take different fittings. Interior bulbs are usually one of these:

• T10 / W5W — small wedge base, the most common.
• BA9S — bayonet base, common in older European cars.
• Festoon — the long tube-shaped ones, in several lengths.

Pull one bulb and look at the base before you order. If the kit you are looking at does not state which bases it includes, ask.

Checking before you buy

Photograph the old bulbs as you take them out. If a bulb does not come out easily, stop and check for a hidden clip rather than prying at it. Broken trim clips cost more than the bulbs.

Once you know the count and the bases, you can match a kit with confidence. Our interior light kits list the piece count and a photo of the layout, and every product page states the model years it fits. If you are not sure, the vehicle finder narrows it down by brand, model and year.