Seedlings i would if i was you use a sml cfl. keep it about 2 inches from the bulb. seedlings and 357 magnum is not a good mix (Uv is to challenging for the lil ones).
im using 2 t5's 4 bulbs each until about a month old then ill start with veg for 2 weeks then go to full spectrum for to weeks then go to flower under full spectrum to finish i am using a 357 mag plus