I do this sort of thing with my tanks pretty often--big light on a limited photo period for plant growth, with a weak light (led or otherwise) that just produces illumination on either end.
When I was running a nova extreme T5HO on my 37g, the low light was a marineland single bright LED---whites were plenty to provide viewing and the blue "moonlight" affect was nice as things wound down in the late evening, but neither provided enough light to affect plant (or algae!) growth.
|