Nate Nagel wrote:
if you take two tubes out of a four tube fixture, is there any current
flowing through the unused ballast? (assume two ballasts, one for each
pair of tubes.) Any downside to doing so? I'd only like to leave this
like this for a week or so until I can wire up two switches.

thanks,

nate
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Hi,
Quick answer, No. Usually inside two and outside two are paired.
You can remove either pair. Current can't flow on open circuit!