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Posted by Terry on October 7, 2006, 4:07 pm
On Sat, 07 Oct 2006 19:59:33 GMT, invalid@notreal.none (Beachcomber)
wrote:
>
>>>How much current is drained by a 2x 40 watt T12 magnetic ballasted
>>>shop light trough at peak current draw? I assume this is at startup,
>>>while trying to saturate the transformer and ignite the tubes. How
>>>much
>>>is drawn once the lights are running?
>>>
>>>Short version: How many such fixtures (too cheap to replace
>>>the old ones) can be run on a 15 amp circuit?
>
>I have an old textbook that says to allow 20% of the total lamp
>wattage rating for power to the ballast. That would mean 1.20 x 2 x
>40 watts = 96 watts total power consumed (not appartent power) for a
>simple dual-40 fixture.
>
>Maybe the new electronic ballasts are more efficient than this?
>
>Beachcomber
>
That is lamp wattage. Not the ballast.
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