to be honest you don't want the plant actually touching the light it causes moisture in turn burns the spots with moisture
created by heat and no where for it to transpire, if you keep it at least an inch off the light you wont get burn you may get bleaching
depending on plants genetics 4-6 inches some wont bleach some will at 12-18 inches most plants wont bleach some still will
at 18 to 24 inches it be rare for the tops to bleach but what I do notice it the tops I have closer to the light get much bigger
just thought id lay out my observations from the 3 years use of Advanced LED's
but yea it be cool to have some of them led strips and run em through the plants
You know I was joking right?