Abstract: A circuit on a curved surface is provided where the circuit includes at least one circuit element on the curved surface, at least one conductive path on, and integral with, the curved surface, where the conductive path is connected to the circuit element, and means for supplying power along the conductive path to the circuit element. The curved surface may be a helmet, in which case a plurality of pairs of light emitting elements may be provided thereon where the pairs emit light sequentially one pair at a time in order to maximize the brightness of the light emitted and maximize battery life. Also, means for receiving an infrared or ultrasonic signal may be provided such that the light emitting elements emit light in a certain manner as a result of the signal being received.