whatever soil you choose, get something that has no nutes in it at all. that way you decide when and how much they get w/o wondering if you're gonna burn them.
18/6 mean 18 hours of light and 6 hours of no light same goes for 12/12 ---how do i post questions like that? i kinda want to know if regular light bulbs work? like 100w light bulbs?
Regular incandescent bulbs dont have the correct spectrum that plants need. You need to use fluorescents or HID lighting. Check this out: http://www.rollitup.org/4674-post6.html