light dist/browning

hey all. my 5 plants were planted on about fed 15 and they are now about 3-4 inches. does that sound right on track? they are just in soil with two 75 watt flouros over them.

one 3 of the plants the leaves are looking brown. the plant is standing on its own, but im thiniking i had the lights to close to the plants, i had them about 1-2 inches away at first b/c i didnt think floourescent lights could put out that much ligh. i now moved the lights back to about 5-6 inches off the plants. i havent noticed a reduced amount of browness, but i just did it yesterday. should they just continue to grow and the burning of these few leaves will be irrelevant? even if lights being too close was the real cause of the browning.

thanks alot

 

It is unlikely that the lights are causing the browning. I can't say for sure what it is... maybe pics would help.