What type of PAR are you seeing on the sand bed?
Bill
At 100%, 2 Reefbreeders Photon 32 (Evergrow IT2080) fixtures measure 380 PAR for me at 100% at the sandbed, dead center under each fixture, 22" deep water, 9" height above water, 125 gallon 6ft. long tank. The Radion Pro measured 350 in my tank, and I would need 3 to keep it that way. I kid you not.
The fans are quiet, unlike the Taotronics and many other versions out there.
At 100% for an hour, the fixture is cool to the touch. The Radion Pro is hot to the touch and will burn your hand at 100% for an hour.
You can see the PAR meter in tank in this pic. I sold my Radion a few days after the test. I also upgraded the layout from cool white/warm white which is in this pic, to neutral white, cyan, and 430+420nm violet since.
This is from a few weeks ago, and there has been more growth since, which I can try to take a pic of tomorrow.