I use 6x6 Deville LED spots, but i placed them right above the airstones.
Gives a more subtle shiny bubbles effect instead of a beam.
Plus, i admit, i use coloured lenses nowadays, for the white light is indeed pretty bright.
I do like the blue LED's ,so i put a bundle of Xmas LED's on top of the tank as well.
I think i spent half my fish observations at night, also due to my strange working hours...
Nightlights are a blessing!
On Oscars sleeping with the lights on, i read that Oscars can actually turn off all visual signals to the brain when they want to sleep.
They can do this because they can't close their eyelids.
A Oscar will not be able to see anything at all.
I observed my O with several kinds of nightlighting, and with no lights at all.
He seems not to mind and there's been no change in his sleeping pattern.
He goes to sleep at the same time, as when i still turned of all lights.
on the other hand i keep fake hanging plants on one side of my tank and i dont have the light on top of those.
So there is actually 1,5 feet of real dark tank at any nighttime.
My O is the only fish that goes to sleep every night.