When a ballast fails in a preheat fixture, should the bad preheat ballast be replaced with a more modern type?
Advantages of a rapid or trigger start ballast are that the starter (a high failure part) is eliminated and the fluorescent lamps may last longer as a result of less stress during starting. Disadvantage include cost of the ballast and possibly space limitations inside the fixture. However, since a defective starter may ruin the lamp controlled by it, the potential cost of replacement lamps may offset the additional cost of the ballast. All in all, this is probably not a decision affecting the future of the Universe but in certain cases, changing ballast types may make sense.
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