I've tried growing 4 plants behind a window then the lack of sunlight forced me to use CFL lamps. It saved my plants and i got very nice leaves until now but had to increase the artificial lightning and now i feel it can barely satisfy 1 or 2 plants since they've all reached the flowering stage and there are leaves everywhere. CFL lamps are partially opaque to their own light and not very efficient on top of that. I'd say you have about 3 weeks to think this over before difficult issues arise... Luckily, it seems my AutoMaria II (autofems) growth slows down significantly once those have started to grow buds. I'm using telecopic tripod supports to hold the lamps right now, i wish i could use tubes instead. I can't tell about the specific spectrums vs plant phases yet, all my CFL bulbs are 45 Watts 3000 lumens 4100 °K anyway. If flowering seems too slow in a couple weeks i'll have a hint why.