I run the aquaticlife fixture on my 55g. It sits 21" from the substrate and I daily dose excel and still needed to run 1 layer of window screen to cut down the brightness due to BBA outbreak.
Since you not going to run any co2 at all, and substrate is much closer, you may need to run 2 layers of window screen like speedkilz suggests.
The plants will be fine. I'd worry about algae.