Best lighting measure?

[will?]

After changing all sorts of parameters, I’ve come to the conclusion my torch corals and macros have been struggling under too much light from a pop bloom LED. The light sits about 15-20cm from the tank surface, the water starts about 15cm from the lid, and the torches sit about 30cm deeper. The macros (cactus caulerpa and suction cup caulerpa) sit from about 10-20cm underwater. The macros have been on and off bleaching for a while, but they’re still growing, but the torch is retracting its flesh and changing shape a lot. I was wondering if anyone has any good light spectrum % recommendations for torches or macros, or any good recommendations for underwater PAR measuring devices? Sorry for the long post, and thanks in advance.

 

[Mr. Mojo Rising]

How many watts is the light and what size is the tank? What intensity is your light set at?