The complete guide
H7 Halogen Headlight Bulbs, A Straightforward Buyer's Guide
The problem with a blown headlight
A headlight rarely dies at a convenient moment. It goes out on the way home in the rain, or you find out because someone flashes you, or a passenger notices the pool of light on the road looks lopsided. Either way, the car is suddenly harder to drive at night and more likely to attract attention you do not want.
The fix is usually simple and cheap. One bulb has reached the end of its life, and a replacement bulb of the same type puts things back to normal. The part that trips people up is not the fitting. It is working out which bulb they actually need, because headlight bulbs come in a surprising number of shapes and only one of them will physically go into your headlight.
This guide is about the H7 fitting specifically, and about the single 12 volt, 55 watt halogen bulb on this page.
What H7 actually means
It describes the physical base of the bulb, the flat plastic collar with two small locating tabs that slot into the headlight holder in one position only.
That one position matters. In a reflector headlight, the shape of the beam and the sharp cut-off at the top come from the relationship between the filament and the curved mirror behind it. Shift the filament a few millimetres and the beam changes. The H7 base exists to hold the filament exactly where the headlight designer intended, every time, without you having to adjust anything.
So when you buy an H7 bulb, you are buying a base shape. The 12 volt rating tells you the electrical system it suits, which is the normal system on most cars. The 55 watt rating tells you how much power it draws, which is the usual figure for a 12 volt H7 halogen bulb. Those three details together are what you should be matching.
How to confirm the fitting before you buy
There are two reliable ways, and both take about two minutes.
The first is the owner manual. If it says H7 for the headlight, you are in the right place.
The second, and honestly the better one, is to look at the old bulb. Open the bonnet, find the back of the headlight, and pull the bulb out. The type is almost always printed on the metal base or moulded into the plastic collar, along with the voltage and wattage. Reading it off the part in your hand removes all doubt.
Please do not guess based on another car that looks similar, and do not assume both headlights on your own car use the same bulb type, because some designs use different bulbs for low beam and high beam. We list fitment by fitting type only. We cannot tell you that this bulb fits a named model, so the check is yours to do.
Why halogen still makes sense
Halogen has been around a long time, which some people read as old-fashioned. In practice it is a sensible choice for a car that was built around it.
It lights instantly at full output, with no warm-up. It needs no driver box, no fan and no extra wiring. It draws power in the way the original circuit expects, so dashboard warnings and bulb monitoring systems behave normally. And it produces that warm white light that most drivers find easy on the eyes in fog and rain, because warm light scatters a little less off water in the air than very cool white light does.
If your car left the factory with an H7 halogen bulb, putting another H7 halogen bulb back in keeps the headlight doing what it was designed to do. The best replacement h7 bulb, in most cases, is simply the same kind of bulb that was in there before.
One bulb or two
We sell this one bulb at a time, which gives you three sensible options.
Buy one if a single side has failed and you just want the car right again. Buy two if you would rather change both at once, which many drivers do because the two bulbs have shared the same hours and the second often follows the first within a few months. Or buy one purely as a spare to live in the glovebox, which costs very little and saves a great deal of hassle if a bulb goes out somewhere inconvenient.
If you do fit one new bulb alongside an older one, the older side may look slightly dimmer or warmer. Filaments change a little as they age. It is normal, it is usually not very noticeable, and it is easily solved by changing the pair.
Fitting it without drama
Most H7 changes are a short job, though access varies hugely between cars. Some let you reach straight in. Others want the air box or the washer bottle moved out of the way first.
Start with the engine off and the lights off, and give the headlight time to cool. Halogen bulbs run hot, and so does everything around them. Then work through it calmly. Remove the dust cover at the back of the headlight, unplug the connector, release the wire spring clip or twist the retaining collar, and lift the old bulb out.
Handle the new bulb by its metal base or plastic collar. Do not touch the clear glass with bare fingers. Oil from your skin bakes onto the glass once it heats up and creates a hot spot that can shorten the bulb's life. If you do touch it by accident, wipe it with a little methylated spirits on a clean cloth and let it dry completely before fitting.
Seat the new bulb so the tabs line up, clip it in, reconnect the plug, and refit the dust cover properly so water stays out. Then switch the lights on and check both sides before you close the bonnet.
Care, storage and when to replace
There is not much maintenance to a headlight bulb, but a few habits help.
Keep spares in their packaging and somewhere dry, so they are not rolling loose in the boot collecting dents and damp. Clean the headlight lens occasionally with a soft damp cloth and mild soapy water, since a hazy or dirty lens dims the beam far more than most people realise. Avoid solvents and abrasive pads on plastic lenses.
Watch for warning signs too. A bulb that has gone noticeably dimmer or shifted colour is often near the end. And if a new bulb fails quickly, look at the cause rather than just fitting another one, because heavy vibration, moisture inside the housing or a poor connector can all shorten bulb life.
About approval markings
We do not claim an approval mark for this bulb, and we will not describe it with terms we cannot back up. If the rules where you drive require a bulb with a particular marking, the sensible move is to read the marking on your existing bulb and then contact us before ordering so we can tell you exactly what we know about this item. We would much rather have that conversation first than have you return something.
The short version
Check the fitting on your old bulb or in the owner manual. If it says H7, this single 12 volt, 55 watt halogen bulb has the matching base. Decide whether you want one, two for a matched pair, or an extra for the glovebox.
When you fit it, let the headlight cool, hold the bulb by its base rather than the glass, and make sure the dust cover goes back on properly. That is genuinely most of it. A headlight bulb is one of the few jobs on a modern car that is still well within reach of someone with a torch and ten spare minutes.