I have Maya 2018 and am working on a street scene. All the Arnold lights work great, but when I try a standard spot light in the scene nothing happens until I turn up the intensity AND exposure to literally over a million, then all I get is a big black spot where the lights should shine. I've tried everything I can think of, turn normalize off and on, created a whole new scene and imported everything into it, deleted the preference folder, etc. Could it be my video card? (which is not the best) Any suggestions would help