No, Its the one piece of equipment I didn't buy that I wish I had. There are very few par threads with the 8X39watt sunpower in them but I have sps that grow beneath branches of other corals, so I'm sure its putting out a lot. It has led to a bit of guesswork about how high off the water to set it. How high is your fixture off the water? Most of the PAR readings from properly cooled ATI rigs are surprisingly high.
Everyone says "if there is too much light the corals will get very light and/or bleach." I had the light as low as 3 inches off the water with new bulbs and a pretty white mix and never had that happen. The colors did get a bit duller though. I noticed that some of the corals like the green stag on the left had reddish tips rather than white when the light was lower and more intense, almost like a sunburn. I tried lifting the light up and the colors improved(intensified) and the tips lightened to white on the green stag. Growth was consistently good.
One interesting coral response was with the red planet - with more intense, whiter light, there was only a small amount of pinkish red at the tips, the rest of the coral was light green. Everyone says that means the coral needs more light. I raised the fixture 4 or 5 inches and the coral became deep, rich, red.
My White whale is a stag in the center of the tank that was like a blue glow stick when I got it. It is growing and doing well, but the base color is sort of a reddish brownish purplish color. I want it to look like it did when I got it. After lifting the light up I moved the fiji purple toward the center of the fixture, just over the coral. All of a sudden a big chunk of the coral lightened, almost like the original color! That is why I continue to play with mixtures of color and intensity... because I'm crazy for color! I'll get it figured out for all the touchy corals if it kills me...