For the sake of arguement, let's say that the lights were 400W metal halides, and there were quite a few of them. So you want to have as many of them as possible on the same circuit to avoid having to use larger lighting contactors, etc; thus powering them at 240V. The exit signs and emerg. egress lights have to be on the circuit serving the room, so where does that leave you?Can you replace the 2-pole breaker with a single pole and power the light with 120V?
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