Check Basic Settings and Bulb Quality First
A flickering light bulb could be caused by any number of things. So, when you’re troubleshooting, start with the easy stuff and make sure you don’t overlook anything. Is the light switch turned to the on position? With some lights, especially those with in-line switches or roller-type switches, it can be difficult to tell for certain. Test out the switch and make sure it is working properly.
Then, do a cursory check of the bulb itself. Is it loose or rattling in the socket? You may have the wrong type of bulb, or it may not be screwed in all the way. This is also a good time to take out the bulb and give it the shake test. Many incandescent bulbs will make a light tinkle sound while still alive. However, a deeper, more obvious tinkle indicates the bulb has burnt out.
If it’s a clear incandescent bulb, you can look at the filament directly to see if it is broken. LED and fluorescent bulbs won’t rattle when they die, so this method has limited uses.
Article source here: 6 Ways to Fix a Flickering Light Bulb
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