Car Light Bulb Burn Out Combustion Frequency
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Everyone is familiar with burnout light bulbs. In household lamps or lamps, when the filament overheats and breaks, it is often accompanied by a flickering, sometimes humming, or loud popping sound. A burnt-out car headlight is usually a more subtle event. If you drive mostly during the day, you might not even notice it, but a headlight or taillight could burn out and stay dead for weeks before you realize it's gone. Often, one needs to drive at night to notice it, or even get pulled over because the taillights are out.
A typical halogen bulb, the kind used in most vehicles for headlights and taillights as well as indicators and hazards, is expected to last about five years.
So why do your bulbs burn faster in older vehicles? Halogen lamps that last five years will last longer, but once you have to replace them, they may burn every year or two, or even more often, depending on the quality of the bulb. In extreme cases, we even know someone whose headlights burn out every six months.
One reason to seal the headlamp housing is to keep moisture out. Water is very good at breaking anything it touches, from rusted metal to worn rock to frozen and cracked concrete. Water can erode or destroy anything over time.
The second most common cause of a halogen bulb bursting is touching the bulb with a finger while it is being installed. Usually, when you follow any kind of maintenance guide or tutorial to replace a headlight bulb (like this one) you'll see a line in it that says "be careful not to touch the new bulb" or "don't touch the glass bulb" or "Wear gloves when handling new bulbs".
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