If your fixture is an older one with both bulbs in series, and it begins working even if you just replace one of the bulbs, I think the following is happening:
The gas in a bulb needs a minimum "firing voltage" in order to ionize and begin to glow. As the pair of bulbs age, their internal resistance/internal voltage drop rises to a point that the ballast can no long supply the needed firing voltage and the pair begins to flicker or go out. By putting in a new bulb, even if the other bulb is old, you are reducing the needed firing voltage and increasing the ionizing current back into a range that can be supplied by the ballast.
Doug
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Posted by: Douglas <sparks06524@yahoo.com>
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