Grim, do you have a preferred cutoff in water depth where the effectiveness of T5's diminish. I know its relative to the specimens you want to grow, so say the higher needs of SPS and clams. I haven't been able to obtain a PAR meter yet, but running a Tek 8x54 actively cooled with a combo of:
ATI Blue Plus
UVL 75/25
GE 6500K
ATI Blue Plus
UVL Actinic White
ATI Blue Plus
UVL 75/25
ATI Blue Plus
What type of PAR readings do you feel are sustainable for high light creatures? Bulb combo preference for growth only, not looks? I am working with a depth of about 32 inches from the bottom of the reflector to top of sand bed. Clams are doing alright and showing growth on the sandbed, but.........