Final Note
My only theories are that I'm exposing for too much ambient, but it seems to be only with that specific light. I have authorisation to talk with the lighting staff and sort out a solution. May I note that this is in maybe 1/20 of the pictures I produce, usually when that purple light is directly hitting the subjects. It's not a huge problem, but it's one which I have no answer for.
Thanks!
I have "similar" problems in the club I work at, whenever my problematic lights are on I just set the photo's to B&W, add quite some shutter speed and done, no more light problems, plus some variation of color & b&w photos in the set. 
Another thing I sometimes do is wait (few instants) until the light continues rotating away from the subject...
an example of the result (putting the camera as high as I can above my head and pointing down) is
![]() | HTTP response: 400 | MIME changed to 'text/html' |
forget about the expression of some of the subjects...


PS: You are using aRGB in your camera as color profile right? and shoot in good quality (not saying large image size, but using the "curve" and not the "stairs" version of your image size?)





















