So I will start by saying that I sure am glad that I "rented" a PAR meter (Apogee MQ-510 ) from BRS. The results were not what I was expecting. I have am older model WaterBox Marine 60.2 that measures 17 5/8" x 23 5'8" x 23 5'8", and I am running an Ecotech Radion XR15 Pro G5 with diffuser on an RMS mount. I have been running the AB+ schedule at 60% intensity assuming that it was enough for a mixed LPS and SPS tank. Well, the PAR values were nowhere near what I thought they were going to be. I tested them at 60%, 80%, 90%, 95%, and 100% intensity. At 60% the top of my rock where I had been placing SPS was at 175 and the bottom of the sand around 80. Yikes! At 100% it was 300 at the top of the rocks and 140 at the sand. I posted my full range of measurements in the PAR Database post. Overall, I really overestimated the power of the light. I think I am going to run it somewhere around %90-95 and see how the corals respond. Are these values surprising to anyone else?