would the early adopters of this light say that the sat plus would work for a low light set up (no CO2) in a 40g (30x18x18)?
hmm, my 20 gallon high is 16 inches deep i believe, not sure if the PAR would reach fine for 18 inches, but in my tank the ground plants get enough low light for sure. that's with CO2 and dry ferts though. the cardinal flower plants are shooting up and even showing roots on the stems, so it's definitely growing.
and above post, gotcha on that - the RGB was more of a bells and whistles fun thing for the kids, but when it's serious plant growing time i leave it on full spectrum, and the plants do respond nicely - again, low and medium/low light plants.