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The T-8 ballasts at Home Depot are 0.90 ballast factor while these ones are
1.3 ballast factor which makes it more efficient (not energywise, but output
wise) and more expensive.
Ballast factor is a measure of the actual lumen output for a specific
lamp-ballast system relative to the rated lumen output measured with a
So the higher the ballast factor the more lumens will be output.