I don't see to many spots on your plants in the diary, I fell this is a one off and nothing to worry about. At first glance I though it was a but of light burn like if some water was left on the leaves when the lights came on. If this is happening, this is most likely the cause.
Side note, the plants look like they are experiencing the beginning of Nitrogen toxicity to me, Bit to dark for my liking, this will make the leaves very brittle later on.
Best Of Luck!
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