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You almost got it. In the 28 watt config. one power lead goes to one end and the return goes to the other end. If you run 2-28 watt leads to one end and one or two return leads to the other end you are running 56 watts to the bulb. That is a very over simplified explanation though. It is basically the power of two 28 watt bulbs into one 54 watt bulb. Now that is assuming that the ballast is meant for 2-28 watt bulbs. :-) If you have two leads going to each end of the bulb it is a safe bet that is what is being done.
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Jack
S.L.A.S.H. Custom Made for Enthusiasts.
And the more I know, the less I understand
All the things I thought I'd figured out
I have to learn again
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