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Many people have them on a reverse cycle with the main lights to help with pH but to be honest I’ve been using a refugium for about 3 weeks and haven’t noticed any difference
It also depends on what your trying to achieve with nutrient levels.
My light is on from 1opm to around 5pm the next day
We had ours on 24/7, didn’t think it was doing much, changed it to reverse cycle and algae has exploded in the display, so it obviously was doing something, have put it back on 24/7 now!
Like all plants typical daylight hours with a decent night period is good.

