Can't help with flowering info as I'm not at that stage yet and won't be using them for flower, but I have a 2 (55W per bulb 6500K) bulb PL-L that I have my seedlings growing under and they seem to be really loving it. It puts out little heat and keeps the kids warm (77-79 F lights on) but not hot. So far I'm very pleased with it and will be getting more.