Doesnt sound like a light issue, start a new thread and post pictures with more info and youll get some help.
I think that I have a version of what happened. My plant was under a
150w CFL without reflector in a
1.14x1.14x2 tent so there was literally no space
(3 gallon pot). Then I switched at day 45
(from sprout) to
2x2x5.3 with a
QB288 240w set at
120w and at high
20" from the canopy
(50000lux=728ppfd measured by a mobile app) and then she just tacoed all the leaves and burnt at tips. I've reeded alot of articles about heat/light stress and it seems that its the right direction. After lifting the panel to
24" and lowering power from
120w to
80w (25000lux=364ppfd) she looks good. I've just switched to
12/12 this day and was afraid of loosing potential because of low wattage
(80w) but also dont want to burn it again. So I have no idea about the height and power to set, anywhere I read people tells to set the panel from
14" to 24" at full power but no one speak about different conditions, like tent size and the temps in it nor LUX/PPFD. Also I've found a method of calculating the PPFD by measuring LUX and convert to PPFD
(LUX*0.0145=PPFD).
HLG says to stay at this ranges
(ppfd): Veg from 350 to 500 and
flowering from 400 to 800. So after this formula I understood that I started at
728 when I set up the new lights so there was no time to adaptation from a 150 CFL to LED set at a high PPFD levels. Its just my version, maybe its false, but it seems logical like that.