Steam particles arent effected by stationary colored lights anymore =/

I have a seen with a couples of steam particles effects (the ones in the starter content). Now they arent effected by colored stationary lights I have in the scene anymore, intstead they just apear white and generaly dont look as good. I suspect it might have something to do with some kind of global rendering settings someone may have changet in our project to speed things up, but I cant figure out what it might be.

Do anyone have any ideas?