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It depends on the type of double fluorescent fixture and the tubes you use in it.

If you use regular T-12 tubes, you would use 80 watts plus whatever losses you get from the ballast (up to 20 watts).

If you use energy saver T-12 tubes, you would use 68 watts plus the losses from the ballast.

If you use a T-8 fixture, you would use 64 watts plus whatever losses from the electronic ballast which are next to nothing in comparison to a magnetic T-12 ballast.

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12y ago
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6mo ago

A typical double fluorescent tube light fixture consumes around 36-40 watts per tube. Therefore, to run a double fluorescent light, you would need approximately 72-80 watts.

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Q: How many watts to run double fluro light?
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