>From personal experience, I know that at the lower end of the brightness scale a 1/256 change in trigger phase for an AC phase control dimmer is ver= y visible. I wouldn't be surprised if 1/1024 is at least noticeable to some people. ~ Bob Ammerman RAm Systems --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .