Jestep, I have mine under a 250-watt metal halide, 20k spectrum running 10hrs a day.
All you LED guys, start it lower in the tank and acclimate it to the LEDs. Most SPS aren't so keen on the pinpoint lighting from LEDs and will take some time to adjust.
I couldn't kill this stuff in my tank even if I wanted. Trust me, I've tried to kill the blue polyp digitata twice now and it keeps coming back.