I’m thinking this looks like magnesium deficiency but being a newbie I’d like some confirmation.
Looks more like you got something on the leaves under the lights and it burned them.
You never want any water to get on the leaves while lights are on. Dont ever spray them with lights on.
I am also starting to see this a LITTLE bit in my autos referring to the discoloration in the bottom fan third leaf from the left. I believe this is coming from a need for a little more magnesium. The plant could be moving nutes there now, but could need more mg or your pH may be slightly off or in transition. Either way, not really a big deal imo. Just look for signs of it increasing then tun your checklist…pH good for mg uptake? EC/ppm etc etc etc…doesnt seem bad tho. I’d also keep an eye out for any N toxicity depending on your medium and feed regiment accordingly.
What water are you using. Should always use calmag with distilled, bottled or reverse osmosis water. Even like kroger drinking water only has 4-6ppm. Gotta use calmag to return the nutrients water is assumed to have naturally and to be able to properly oh the water. A ticket is a good start to real help.
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There is no deficiency on the small plant. Do you have pictures of whole plant that leaves came off of?