After reading this thread, and it being my first experience with this particular lighting medium, I gather looking at my plants response over about a 48 hour period, 2" is too close. I noticed crinkling with some leaves on the tallest plant @ 18". So, I've raised the light to 4" above the tallest one angled toward the smallest using a folding tape measure that I can get a 90 degree with light and floor. I have another instrument that I can measure the angle with but I don't think its relative yet in side penetration. Since they were under a single CFL before they went under this system, they may need a bit more acclimation dialing in the right canopy to light distance and differing plant heights.

I always kept my confiscated 430 HPS system about 14" and it was about right in a 4'x8' area.

My temps haven't been over 80 degrees in the 2'x7' closet so far, and the heat is shut off to most of the house since I'm only using a couple of rooms. So far so good in this new experience. :smokin:

Now to fire up some of the outdoor and let the girls work it out!!!! :stoned: