i have six plants, two rows of 3. two HPS suspended over top, one 400w, one 175w. I happened to have two lights and a 400 would prob suffice but this 175 is quite a complement. Didnt plan it this way, I have just acquired them both luckily. I clamped the uv light to a bar at the end of the table, the long end, prob a foot out and a foot above the tops, but some plants are significantly taller, so @ about 12" diagonally from the closest 2 plants , and at a 45 maybe steeper as to hit most of the plants from an angle, the next closest 2 were maybe 24" away, and the blueberries were at the opposite end about 3ft away. the layout is more or less a rectangle, 2x3. yeah it is a sunburn for sure, I have pistils turning brown now on just the sides that were facing it. it is progressively getting worse. definitely the light. if I had just dropped it directly centered and above them, maybe if i had taken the hood off the lamp and just suspended the naked CFL bulb between the two HPS that are right over head this wouldnt have happened. It seems as if the light was so concentrated from the mylar cone (pretty narrow cone too) around the bulb. that first day it ran for a few hours but with the neck being so adjustable on the lamp I would redirect its aim every 20-30 minutes, the second day things seemed funny and I only ran it for a little bit, and my sister came over for about 30 minutes that day and I shut it off and the 400w light( it looks like a tanning salon in my closet, but just the 175w lamp is very discreet and can keep things going by itself for a very short period time). I never turned the uv bulb on after that bc I had a basketball game and was going to be gone when the lights timed off and I didnt want it running and didnt know if i'd be back that night. then the next day I noticed major problems and even today as the time goes on its getting exponentially worse. Enough tension and stress that I have to write these long watered down messages to keep my sanity, and I have nobody to talk to about it, I live in Utah and I am one of few on this side of town that enjoy such things. Salt lake is amazing, but i am about 45 minutes out.