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Posted by itsJR on January 10th, 2003 08:57 PM
In reply to Florescent lighting by Edward Stevens on January 10th, 2003 05:18 PM [Go to top of thread]

Magnetic (armature type) ballasts operate at 60 hertz -- turn on and off 60 times a second. Some people can see this, but most noticable when viewed next to a computer display or on a televsion broadcast. Electronic ballasts, although 60 hertz, turn on and off somewhere around 25,000 time a second. Not noticable.

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