Nutrient deficiency or light burn ?

Hey friend, So definitely drought stress can trigger other irritations, but one day of it shouldn't do anything other than droopy leaves. I think your spots might be more down to moisture buildup here and there on some leaves and its causing little bits of bleaching...sometimes it can be from chlorine in water, the light reaction to it etc. So I'd say stay humid, but avoid droplets and spraying anything during lights on(even just misting the plants with water). Overall your garden looks happy and strong. ✌️

Plants subjected to UV light will naturally turn purple. I will keep an eye on it as combined with the leaf could be the start of a mag diff

For the color of the leaves and the tips in my opinion is a light burn. Also you have mg definciency for the color of the stems ( purple, with led light plants tend to eat micronutrient a little bit more) the tips could possibly sign a Mn definciency that is immobile but is very rare. Hope to help, keep on growing