Off topic. I transplanted mine 2 days ago going larger. I decided to do a test and took a plant that was a extra/spare I wasn't going to plant. Put it on the window, and I feel like the leaves have greened up a bit.
With that said, after seeing Harry's pics - which more or less was inline with the recommend manuf. specs on mine - I had mine set at 12 inches or so, with the dimmer full blast on seedling, and halfway on veg.
I raised my lights up and have tweaked the light output as will. No fancy meters here, but more a change/observe sort of deal. I have noticed that DIMMING the output on my annual seedlings seem to actually promote leaf growth.
So I believe even though technically, the leaves were not burning, I was ~stressing~ them.
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