yellowing leaves...

this is the only picture i could get to turn out.. you can barely make out the yellowing and discoloration of the lower tiers. if anyone has any suggestions id appreiciate it.. ill try to get better pics up. quick question, how far should 150w gro-bulbs be from the plant, ive heard 2 inches and i was told 2 feet so please clear that up for me.... thank you again.

4 to 6 inches away bro. the yellowing is on the first set this is the norm.

cool thanks man, there are also brownish/dead looking spots on the very tips of some leaves and what looks like brown spots all over some leaves. same pattern as a dalmation. i know a picture would help a lot, as soon as i can get it ill post it.. but if you can help or have an idea id appreiciate it...