@Wimskeweed,
I received my MarsHydro TS1000 today and lost no time replacing the cheap chinese blurple light with it. Much better control over the PPFD and in addition it's silent.
We'll see if things improve. I've now set the TS1000 up 90cm/36" above the plants and dimmed it down to ~450 PPFD.
New images will be posted later today.
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