I have a Vipar 450 in a 1x1x2 meter tent. Been using it through almost 5 plants. It has burned the leaves on all of them. I am limited on headroom. I also have grown for 6 years with a couple of Blackstar 135uv lights. They don't burn the leaves even though I keep them much closer. I'm not real impressed with the Vipar but it cost less than half what those Blackstars did 6 years ago. If I could stand the heat I would go with the hps or lec315. Good growing !!
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Focus and relativity.-
I'm also of the Viparspectra 450 persuasion. No problems so far with one tiny exception and that was me messing up. Manual says 18" is about the minimum distance. We all know that is lawyer-ese so we use that as a guide rather than gospel. My mistake was that the plants had grown into the 18" or closer range and I had visitors. I couldn't get to it to remedy it. Very slight burn but quickly resolved. I do run at about 16" though. AND I now measure every day at least once and try to keep between 16 and 18 inches and no issues.
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