I am wondering if anyone has a recommendation on what % to run this light at (24 inch version) over a 20 G long tank (with about 2 inches of substrate). Shooting for Low / Medium light plants...no CO2. I have it for my new tank and getting ready to add some plants. I was thinking of using their planted profile and then dialing all the settings back to about 40% of where they started, and going up from there. But, what do folks think? I don't have access to a par meter so I can't actually check.