light bulb
A typical incandescent lightbulb burns for about 900 hours. If your bulbs aren't lasting that long, there's probably a good reason why. Here are four common problems, along with ways to fix them.
Problem: Bulb flickers
Flickering is caused by either a damaged fixture or faulty electrical connection that delivers full voltage (120V) and then shuts down. This is the same as turning the light on and off rapidly. It not only shortens bulb life, but it's also a fire hazard because of dangerous heat buildup in the circuit.
Solution: Turn off the power and check the connection to the fixture and its internal wiring. If you're not confident in your abilities, call in an electrician.
Problem: Bulb burning too hot
If bulb wattage is too high for the fixture or if the bulb is in an enclosed area like a globe, heat can't escape and builds up in the bulb.
Solution: Use a lower wattage bulb, or use a larger fixture or globe that allows heat to dissipate.
Problem: High voltage
Solution: Check the house voltage with a volt-ohm meter. It should be 120V. If the voltage is high, notify your power company so it can correct the problem.
Problem: Fragile bulb filaments
If filaments are subjected to rough treatment or constant vibration — such as a garage door opening, heavy stairway traffic or slamming doors — they break apart.
Solution: Install 130V or rough service (RS) bulbs, which have heavy-duty filaments. This is also a good solution for dealing with lights that buzz when dimmed.

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