I’m not really concerned that it isn’t, but it seems that most people preach that they need 300-400 PAR. I’m fairly certain that it gets nowhere near that. It’s at the top of the tank under about 8” of water with 2 AI Primes mounted about 8” above the water. It’s got a strong reflex to shading. The mantle hangs noticeably over the edge of the shell, but I don’t know if that’s good or bad. And it may be my imagination, but even though I’ve only had it about 3 months, it appears to be growing into the rock that it’s attached to.