Just a quick update since we had a dialog above. I have a Apogee PAR sensor that hooks to my Multi-meter. A quick conversion gives me PAR.
I went down to 4 HO normally driven (54W 4 Foot) T5's on my tank and it was clearly not enough for Acros. The Montis were fine, but the acros reacted like they didn't have enough light.
I then started suspecting my multi-meter because the values I was getting seemed enough, and I discovered that my meter is probably off and reading high (when checked against another multi-meter). I'm going to borrow a calibrated fluke from work for reference to verify, that one should be dead accurate.
Anyway, watching the corals was clear enough, so I got two more T5's to replace the LED strips and my corals are already thanking me. The light is much more even, and less spotty than before, and the overall PAR has increased.
I'm sure I could have also overdriven the existing bulbs but I decided to cover the whole top of the tank first. If I find it lacking later I will over drive 2 bulbs at a time but I suspect I won't.
Whiskey