the light is about 3 ft from the plants.... the only thing is.. the smaller one in the pictures I am using happy frog organic potting mix..... and yes I have a fan running with a carbon filter... and the intake is just the hole at the bottom the negative pressure is bringing the air in there. I was thinking they look burnt but my light isnt that close so maybe nute burn?? I have the foxfarm 3 stage nutes I guess i will hold off on them for a while