is that the kind of light u mean m8? sorry i forgot to say i did have them under this light in very small biodegradable pots with slits down the sides, anways i could see the root/s after 3 days so i re pottted. some with the pots still on some with out(experimenting) the light is osram 18w/765 cool daylight. i also put them under hps coz wasnt sure if that was good enough bulb. when i did go to buy one i asked for a t5 cfl energy saving bulb and they wanted to know what for!! :/ so i went else where and picked one on my own(sort of). thx