If bulbs in one fixture keep failing after weeks rather than the years they are rated for, the bulb itself is rarely to blame. Excess voltage, a fixture that traps heat the bulb was not designed to handle, or vibration from a fan or a door slamming nearby are the usual explanations.
Common causes
| Cause | How likely | What to look for |
|---|---|---|
| Enclosed fixture trapping heat beyond the bulb’s rating | Very common | Bulb fails specifically in a fully enclosed globe or recessed can |
| Wrong bulb type for the fixture | Common | Standard bulb used in a fully enclosed or high-vibration fixture |
| Loose bulb or socket connection | Common | Flickering before failure; socket contact looks corroded or bent |
| Household voltage running high | Occasional | Multiple fixtures across the house affected, not just one |
| Vibration from a nearby door, fan, or garage door opener | Occasional | Fixture is near a source of regular vibration or impact |
| Faulty dimmer not rated for the bulb type | Occasional | LED bulbs specifically, on an older dimmer designed for incandescent bulbs |
How to narrow it down
- Check whether it is one fixture or several
Bulbs failing across multiple fixtures in different rooms points toward household voltage running high. A single fixture pattern points toward something local to that fixture.
- Check the fixture rating
Fully enclosed globes and recessed cans run hotter than open fixtures. Confirm the bulb you are using is rated for enclosed or high-heat use if that is where it is installed.
- Inspect the socket
With power off, look at the contact tab inside the socket. If it is flattened or does not spring back, it may not be making firm contact with new bulbs — gently pry it up a little with the power off.
- Check for vibration
Fixtures near a slamming door, above a garage door opener, or on a ceiling fan can shake bulbs loose or stress the filament or LED driver over time.
- Match dimmer and bulb type
If using LED bulbs on an older dimmer, confirm the dimmer is LED-compatible — incandescent-only dimmers can shorten LED bulb life significantly.
When to call an electrician
If bulbs are failing quickly in multiple fixtures across different rooms, have an electrician check the household voltage — supply voltage running consistently high is a utility-level or panel-level issue that a bulb swap will never fix.
Stop and call a qualified appliance technician or electrician if you find scorched or melted wiring, smell burning, see water that has reached electrical components, or if the fault returns immediately after a repair. Never bypass a safety device — thermal fuses, door interlocks and flood switches fail for a reason, and defeating one converts a broken appliance into a fire or flood risk.
