How important is it to you that your weapon has a light?

My university doesn't allow most weapons, so my weapon [i]is[/i] a light, and I have to say, I'm fairly confident about it. It's a 600 lumen tactical flashlight, made of airplane-grade aluminum, and covered in sharp teeth. So, I can use it to maintain situational awareness, temporarily blind someone if necessary, and bludgeon them unconscious.

If I were in combat at night, the last thing I would want is a headlight on ny rifle. Infrared or thermal, but not a [b][i]light.[/i][/b]

Not important at all. I had one on my M4 but never on a pistol. The one on my M4 was useful when doing building entries at night but often we had on NODs.