Re: flourescent light

Posted by Gerald J. on September 15, 2006 at 09:38:45 from (67.0.97.192):

In Reply to: Re: flourescent light posted by John T on September 14, 2006 at 18:50:45:

You can't figure fluorescent ballast line currents strictly from watts divided by voltage. They tend to have an obnoxious current wave form with a lot of peak and a small average. Called poor power factor. Doesn't matter if they are old magnetic ballasts or new electronic ballasts the peak current can be 5 times the RMS current and out of phase with the voltage making the watts lower than the voltamps.

Unless the ballasts have been bought at a premium price to be high power factor which isn't a common home center item.

That said, 3 or 4 two lamp fixtures (4' 2x32 or 2x40 lamps), seems a reasonable load on a 15 amp 120 volt breaker.

Gerald J. (electrical engineer).

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