First, thanks for posting your experience with LED scrubber. Do you know at what amperage your LEDs are the most efficent? Down the road I'm going to try an LED scrubber and see what I can do with 100 watts of power. My plan is to run two alternate scrubbers at 100 W each. When one is lit, the other will be dark. I want to light them intensely to push the algae to photoinhibition, at which point the light goes out and the other scrubber gets lit up. The downside is an O2 sensor is a little pricey, but I don't know how else to tell when photoinhibition occurs. I read a paper awhile ago that showed marine algae photosynthesis rates and it was real fast until photoinhibition occurred, then it dropped off like a rock. If anyone is interested, I can try to dig it up.