Collins is most correct, and it is a damned shame that so many will unbudgingly argue otherwise without even thinking about it, because it is what they have always been told and what they have always done.
I always thought it was to be pointed towards the light. Then reading posts here and in other places I was convinced that it should point towards the camera.
Towards the light makes more sense to me.
"People who say things won't work are a dime a dozen. People who figure out how to make things work are worth a fortune" - Dave Rat.