the light can bleach the chlorophyll in a plant, but you'd probably need more than a 150 watt hps. however seedlings are less hardy than bigger plants, so shes in danger of growing too close to the light and burning herself

id keep it a foot or so away. three inches is too close.
and mcgravity you should look it up but either use the t5's or just some ordinary 5000k cfl's
the cfls are great because they dont get hot at all pretty much, so you can put them riiiight down on your babies