I have four 2-tube, 40-watt , 48" flourescent light fixtures in my
basement. One of them began to dim and flicker and then totally died.
Replacing the tubes did not work. I then replaced the balast. Worked
like new, but only for a couple days. Now it is dim and doing that
sort of wavy snake thing. Any idea what could be causing this? The
balast is properly matched to the fixture and tube. It is properly
grounded. The tubes are brand new and were replaced with the balast.
1. Bad contacts for the lamps
2. Wrong lamps for the type of ballast
3. Bad ground
4. Wiring problem
I put them in order. I suspect that it is #1. Try removing and
replacing the lamps a few times. If it starts working again, it is time to
replace the sockets or the whole fixture. Try to get good quality sockets
that can handle the moisture. Consider a new high quality fixture using T-8
lamps for more light less electricity and longer life.
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