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High Ballast Factor-tech question

Here is one for the lighting experts.  I'm putting T-8 lights in my new 55 gallon. I am wondering how ballasts achieve a ballast factor of 1.20 or 1.15. Do they just use more electricity than say a ballast with a 90% ballast factor?  And do the bulbs appear brighter just because they are being overdriven?  Do you need any special wiring for these high ballast factor ballasts?


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