277 Lgts 6 tube T 5's or 6 tube &8's . Can you put them on a 30 amp breaker to get more on a Circuit using #10 wire to feed them?
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210.21A says No looked it up thanks anyway

according to the 2008 NEC, most sockets of flouresent fixtures are not rated for 750 watts there for they are not "heavy duty" If that is the case with your fixtures, then no you can not use a 30. If you are doing a one for one swap out of HIDs to Highbay Flouresent, More then likely you can use a 20 with no problem.