How many should I use for 2-4 plants? I have 2 in 1 grow room, and 4 plants will be in another room. I was thinking maybe 3 40 watt ones in addition to my 150 watt hps to get all around the two plants, and in my other room I have a 75 watt grow light plus I was thinking maybe 3 40 watt cfl's for veg stage. would that be enough you think?