Leaving fluorescent lights on when you leave an area is one of those myths from the '70s that has somehow survived to this date.
The energy needed to start a fluorescent lamp is not significantly higher than the energy needed to operate it. Even if we assume that a fluorescent lamp uses twice the normal amount of power during the starting phase, this phase lasts for only about 1 or 2 seconds so the crossover time to save energy would be less than 2 seconds.
Another myth busted so flip the switch when you leave the room even if you will "be right back." All those "B R B" minutes do add up and will make a difference!
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