Aquarium photoperiod wrt ambient room light

[Rikko]

I would think that gives you tremendous freedom in when you cycle on your lights. Natural light lets you have a natural sunrise and sunset (if you so choose), so by BANG turning on the halides you aren't upsetting anybody too much.
Chances are the intensity of the light coming in isn't enough to really impact your coral growth, but it should serve to keep everybody calm depending on the light cycle you choose.