- Sep 7, 2018
- Reaction score
Working on a SPS dominated reef tank. I am running 5 - 360X and 4 - ATI b+ bulbs in an aquatic life t5 fixture. After hearing SPS really like the 250 - 350 par range I decided to slowly lower my light to roughly 8" from 11". At 11" I was getting on average 220 par at my rocks. I have lowered it down to 9" over the last couple of weeks. Even though I have lowered it 2 inches now, par really has not changed much. I believe this is due to the wide angle lens of the Kessill. That being said I can definitely tell some of the SPS frags are a little upset. Is it possible that lowering the light does not have a big effect on par but can still be more intense? I know, sounds like a stupid question but if my apogee is to be believed Par really has not changed a lot but some sps tips are lighter and coraline seems lighter than it was. I have attached a par map of my old settings at 11" high. Starting to doubt my decision to lower and target 250-350 par. I only have a few frags at this point so I knew if there were loses while upping par it would not be the end of the world. If the tank was packed I probably would not have done this. Current lighting has t5's on for 9 hours, LED's 5 hours at 80%, couple hours at 50%, couple hour ramp on the front and back.