@Dana Riddle thank you for this! I am wondering this myself. I recently purchased a Seneye Reef PAR meter and it is giving readings around 1500+ at the top of the rocks and around 500+ at the sand bed. Seems very high. However, I run 4 black boxes at 100% both channels with 2 80w Blue+ T5s. I am getting decent growth and coloring but wondering if I am stunting the growth. I have an acro dominate tank and nothing has bleached as of yet. Do you think it is possible that the PAR meter is correct?
Also, I am curious how do you know when photochemical quenching is happening and photosynthesis has shut down?
Also, I am curious how do you know when photochemical quenching is happening and photosynthesis has shut down?