Power came back on after 6.5 hours, so I think I'm ok still. I'll probably keep on the 24/0 for veg, just because it happens to suit my purposes at the time - mainly ventilation and light leakage problems I'd run into with an 18/6 schedule. Also, there's a pretty respected guy over at gardenscure that is currently experimenting with 24/0 for veg and having great results. Thanks for everyone's help though!