Although I think it can be silly to go out and try to prepare for every single scenario possible, training in low light conditions isn't a bad idea if you're a bouncer, security guard or LEO.

If you're a bouncer, then you're likely to be aware of how strange club lighting can be, particularly if it's a dance club and there's strobe lighting and odd color combinations moving and spinning together. Imagine coming in from a very bright day into a darkened club or from a dark night into a brighly lit club.

I don't know that you need to start ADDING things into your training mix however to try and "cover" all of this stuff because that's when it starts to get a bit goofy. Perhaps the right thing to do is to pare down everything you do self defense wise into something more simply and universal in nature. This is particularly true if you're a bouncer in one of these joints.