I've played Drakelow tunnels with UV reactive paint, and also played the Sennybridge V night game with clear paint.
If run properly, with people willing to accept the shots and also understand that a bit of overshooting may happen then they are great fun.
Obviously you have to be a little sensible and watch your footing. Usually I'll play night games in a yellow lens just cos that's what was last in my mask from playing the evenings.
Biggest problem with night games are people using super bright tac lights or lasers, who then shine them right in ur eyes. Once these are shone in ur eyes ur night vision decrease rapidly and takes a while to come back.