The LED fixture runs at 400 mA or 200 mA and uses about 40 watts of power at the higher current. It gives about 45 micromols of PAR at the high current, with the fixture hanging about 6 inches above the tank, at near the substrate, about what I hoped for. It has been running at 200 mA for the past few weeks, with no CO2, as I try to switch the plants to non-CO2, so I can use them for the underwater plants for this riparium. The plants, mostly crypts, with some needle leaf Java Fern, and some sunset hygro are doing very well growing with no CO2. I will probably use the fixture at the higher current setting for the riparium.