If only one light works in a fixture, is the ballast bad?
Md Ariful Islam
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Dr. Md Rushad Rahman
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Probably not. If the fixture is a 2 tube fixture, it is probably a single bad tube. If both the tubes are old, you might consider replacing both of them with newer, slightly lower wattage ones to save electricity. For example, if they are 40 watt, try some 32 watt tubes..
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