Sorry for the late reply!
Where mine is, he's getting 290-330 PAR. I know magnificas love light moreso than other nems, so I was worried that 290-330 wasn't enough. The nem was bleached when I got it, about 3-4 weeks ago, and hasn't gained any color back yet. It's still healthy otherwise, hasn't moved from the rock I placed it on and eats well. I moved one of my anemone crabs over to it, I've always thought they help nems acclimate and stay healthier (probably just my opinion.) How long does it take for them to regain their Zooxanthellae, if you happen to know?