How many plants will 4x Gro-Lux 18W T8 2ft set up provide for? I have 5 very healthy plants at the moment in week 5 of veg, I need to switch to flowering now, they have all been grown on normal old shop floor cfl's so far. Just discovered that u can get blue and red spectrum bulbs for my set up (aka Triphosphor gro-lux). my spare bulbs I bought new have 30% in them and have just been sitting there!! should I put them in and then replace all of them with full Gro-lux bulbs? also can I start skimming an hour of light of every night now to get to 12/12? thanks