In one embodiment, a method for promoting the sale of a substitute product at the point of sale. For encoding, at least a portion of a code word is encoded from a signal based value using an approximation of a combinatorial function, wherein the signal based value represents one or more aspects of a signal. The second signal indicates when a dimming circuit at an input of the power supply is utilized. The outer race is rotatable with respect to the inner race in a circumferential direction.