Hey I did get the 21led 20k and 453nm in. I probably should have checked their dimensions before ordering, cause they are HUGE!Let me know what you think. Did you go with the 50w 20k I presume?
Too big to use as supplements above the 30x30. I've plugged them in, but that's about it so far. I have no doubt the much larger housing will handle the heat much better.
Rather than return them, I'll be using them over a new frag tank. At some point I'll beg @mdb_talon to come over with his par meter. Hoping to have it flowing this weekend.