Lighting positions

[mastersativa]

I saw in a post someone said that light hittin the undersides of the leaves isn't good for the plant. Is this true? I have four cfl's on the bottom of my plant aiming up at like a 20-30 degree angle. I have had the lights this way for over a month now and it doesnt seem to be hurting her. Any thoughts?

 

[Mutt]

By nature...the top side is the solar receptors
but...I have always had a touch of better with sidelighting. hard to get that "metal halide in the sky" lumens so do the best we can huh.