Hey, WAKE UP! I am inspired to try my hand at starting seeds this year because it will give me access to heirloom varieties. Attempts at starting seeds have failed in the past because I thought you just needed a sunny window to start seeds. I have two specific questions: Is a 4 foot fluorescent light fixture containing 4 tubes, 400 watts each sufficient? Too much? Is there any harm in leaving that fixture on 24 hrs/day, since it's wired into a switch? OK, three questions. Where is a good, INEXPENSIVE source for obtaining what is necessary for heat underneath the seedlings? Thanks. Diane