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Old 05-12-2013, 10:46 AM   #16
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General question about cost/energy use of additional lightbulbs to a ceiling light

Originally Posted by bcgfdc3 View Post
Okay, So I understand the simplicity of the OP's question but I have a similar question.

Say I have a 4 tube 48" flourescent fixture. Is it cheaper to only put 2 tubes in or does it use the same amount because the ballast is still trying to power the missing tubes?
This is pretty simple

Shut all electric consuming devices off except this fixture. Light it with 2 tubes and observe the meter for one minute. Light it with 4 tubes and then observe the meter for one minute. What did you conclude??



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