Oh!! Thanksnot Ca. that's usually brown (rust) spots.
Naw. Looks like a touch of nute burn if anything. The leaf didn't get wet with some nutes or even water while the lights were on maybe? You can get spots like that where the water collects and under lights can do that too. I've seen a lot of that with people who foliar feed their plants often.The weak one is growing like never before! So sweet but i was horrified when walking in to my grow room today, the strong healty one has shown a weakness! A few brown spots on ONE leaf!
Is this calcium deficiency?
If it was the light the very top would show it first really. It's not a big deal so don't lose sleep over it.Thank you, been searching all over, but could not find anything, might have gotten some spray on it or maby its the light, i put some styropor under the buckets and didnt think the light would burn it by decreasing height by 6 inches, guess its possible