people are always preaching that you can get cfl's as close as an inch...2 things 1st if they are 1" away...you better be dedicated. 2nd cfl's are great for starting out a grow and it looks like you got it together with your 400w hps.

as far as cfl's not hot enought o burn your plants...grab hold of that lamp and hold on...If you can...GET it?

leaves will droop/melt quite a bit before they look burnt.

peace.