Herge, I take it you're looking for a folk type stage setup where the lighting is to enhance the intimacy of the act instead of becoming part of the act (like disco lighting etc.) If you're going with a couple of cans (say PAR 38's) you might want to start with some light peach gels (I don't have my book handy but the colors are roughly the same as a 1A Skylight filter for color film. I'd throw one to each side of stage 30-45 degrees to either side and 60 degrees from above so to reduce shadows without getting in your eyes. The gels will take out the pasty face that bare high temp bulbs will give, looks good on all instruments except banjos, and by throwing an additional weaker light directly overhead, can be cooled off if you think it's showing too warm. If you have a couple extra cans, then the dark blue idea (two overhead and to the rear of the front line of the performers, showing about 60 degrees down, and missing the heads of the performers but lighting up the rear wall and instrument stands would work well. This set up will work well for up to three people on stage, but after that you're going to have to open it up with other cans to prevent one performer from throwing shadows on another. If you are going cheapo by wiring house dimmers into each extention cord, remember they can cause a hum in any sound applification, so get a good RFI-EMI power conditioner and plug everything involving sound (not lights)into that. Good Luck!