My plans are for a 40gallon breeder, with 3" substrate in the front and a bit deeper in the back. The light is the 30-36" version, 117 LEDs and full spectrum. PAR at 12" is 80, CT 6500K, luminance at 12" is 3000Lux. DIY CO2.
Would using one allow for low light plants with max of 15" deep to substrate? Would using 2 over the tank be good or bad?
I'm still trying to understand LEDs. I last used T5s back in 2005 or so!