Well, if you are looking to make it look like there isn't any lighting, one of the tricks is to make sure there are visible light sources in the shots (like lamps or something), and then set your other lights up so that it is slightly brighter in that area. It gives the impression that the light is still coming from the lamp or whatever, but combined with other lights (diffused) you will get an overall nicer look.
Your camera will be much happier
