Really that's not bad for a first attempt. a 100w ufo is probably somewhere around 40-65 watts, which would put you somewhere between .75-.5gpw. I like to top my plants, I like to give them at least 2 rounds of being 'cut' - so say 30days veg or so.. (cut@10d, cut @20d, flower @30d). Anyway, congrats again, and good luck on your next round 
