Burn or ?

Plants do not look bad at all! As long as pests would be of no concern, the leaves that are torn look like it could of been from fan/wind damage or possibly handled a little rough when topping or something. Lower leaves that have the couple spots could just be from a little water or something getting on them. Humidifier mist can make plants do some weird things if it's getting on them to much. You mentioned your plant did not like when the light intensity was turned up. You are in veg so no need to give them a ton of light intensity, save the power for middle of flower. Your light at 24"-30" will be perfect. Wait until after the plant transitions and stretches a couple weeks after flipping to flower, then start turning up the intensity each week until middle of flower. Run the light the hardest in the middle of flower and then start lowering it again toward harvest. Here is a good article on cycling light intensity in flower. https://oklahoma-cannabis-company.com/cycling-light-intensity/

Not lights, not nutrient related.............just some funny leaves...........plants will do that at times for no reason, just a weird leaf or two. It will not affect growth rates, yields or potency. If it were all over the plant, then yes, there would be an issue, but one or two funny leaves is not a reason for concern. Your plant will be fine, there is no need to do anything. Remember............. no plant will ever have 100% perfect leaves, 100% of the time!

Yeah....that's not light burn. I would suspect it's either a pest or maybe you damaged a few leaves during your care.

Iron deficiency or too much light.But judging by the spots, it’s more likely an overabundance of light

Def check that thing for pests with a scope

Possible pest damage feeding on the leaf tissue. Check the undersides of leaves might have to zoom in as some pests are hard to see with the naked eye.

light burn would start at the top, not the bottom. - indoors anyway. i think it's a fairly lower percentage, but the shape of the damage in the middle looks like a leaf miner. You'd know by "tommorow'' based on how it progresses in that regard. Random squiggly shapes as opposed to typical more ordered damage from various nute issues that can burn a leaf. Since the other damage doesn't look like this, i'm only mentioning it just in casae. If it progresses in squiggly lines, it could be a pest. in either case, i'd hold off on reacting to this as it is very isolated, so far. See how it progresses and that'll help diagnose with more confidence. don't compound the problem adding something unnecessary, then you potentially have 2 problems. Like someone else said, you may have just dripped some nutrient solution on the leaves. it's also right where that leaf would rub on fabric pot... which could get some nutrients on the leaf (capillary action absorbing moisture from substrate) or just the friction causing issues.

Mini sunn2 320w is alot of light for a 2x2. I know they can only be dimmed to 40% if you buy a cheep light controller like vivosunnfor like 4o$ it will let you dim your light to 25% makes a big difference when the plants are small

Seems like you maybe dripped water on the plant and the water burnt it in the light

Looks like a space problem while growing or leafs rubbing eachother(due to wind) or maybe just a normal mutation. Not something i would worry about or that would make me change something. Rest of the plant seems to look normal so i personally would ignore it, i always have fcked up leaves in some way somewhere on the plant, no matter how happy my plants are

You got a fan blowing on that part of the plant? All in one area and kind of looks like wind burn or damage especially with the tear on one of the leaves. Just my thoughts. See what others may say. Best of luck! Happy growing!

Could be light burn, but as it's only affecting several leaves (at varying heights) I'm more enticed to say it's a nutrient issue. 75%rh ? Is that correct? If so, that could lead to transpiration issues which would affect nutrient uptake and movement. Perhaps this is the culprit? If all else is okay at least.. Hope this helps, even a little :)