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Old 07-12-2016, 01:50 PM
dtilque dtilque is offline
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Join Date: Jan 2000
Location: My own private Nogero
Posts: 5,783
For fluorescents, you still don't want to turn the light off and on casually. It not only shortens the life of the tube but also the life of the ballast.* Even with today's fixtures. The break even point is somewhere around 20 to 30 minutes. If you're going to need the light before then, leave it on.

* The ballast thing is only applicable for non-compact light fixtures.