Yes, they can be blinding. About a year ago I heard that the European community were considering outlawing the Halogen lights on vehicles due to the blinding effect it can have on oncoming traffic. I don't know what the outcome of that was if any.
I spoke with a DM about people shinning their lights in your face....they had a great come back IMHO. Just raise your hand in a stop signal and turn your head away from the diver "until they get it".
There is no need to shine your light at a diver regardless of what type it is. HID I must admit are the worst when you get blinded by them underwater, although I can see the benefits of having one especially in photography. I have been satisifed with my C4 and a backup though and have not found a need to replace either one as of yet.
If prices fall and I need a new light, I'd consider buying one.
Just my .02
I spoke with a DM about people shinning their lights in your face....they had a great come back IMHO. Just raise your hand in a stop signal and turn your head away from the diver "until they get it".
There is no need to shine your light at a diver regardless of what type it is. HID I must admit are the worst when you get blinded by them underwater, although I can see the benefits of having one especially in photography. I have been satisifed with my C4 and a backup though and have not found a need to replace either one as of yet.
If prices fall and I need a new light, I'd consider buying one.
Just my .02