no not exactly sure how to use it, dont have one either. i cant just turn off one of the 15amp breakers and run the outlet on the other?
my room is maxed so i need to use that circuit in a month, planned on plugging in 2 x 600watters.... good thing i checked with fans first!
What ballasts are you running? Mag or digi's? My digitals do 120v or 240v just need to get the correct cord. If yours will run on 240, just get the cord, then you can use that outlet. The older mag ballasts can usually be rewired internally for multiple different voltages, mine can be wired to run on 120,240,277,and I think 360, and 480v.
It is possible to reconfigure the breakers to make it a 120v outlet, I'm not explaining how, there's a few variables, and if you don't know the difference between a 120 single or 240 double breaker, you probably shouldn't be working in a distribution box. Not trying to be a dick, just trying to keep you safe.