I find that LEDs can potentially be VERY bright. I do run them in parallel but when moving my plants from a crowded windowsill I ended up "burning" several standard cattleyas. They are fine now, but the sudden increased light did it.
It is impossible to tell how much light you are getting without measuring. But moving seedlings close to the light is potentially a problematic blanket statement, if you ask me. If your new growth becomes more reddish, backing off would be in order. You can always move up slowly without issue. Burning is irreversible, at least until the next growth.
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