Abstract: A foot pedal assembly for remotely controlling an instrument is disclosed. The foot pedal assembly comprises a base member upon which a foot pedal is mounted. The foot pedal assembly also comprises a means for providing an optical transmitted signal for use in controlling the instrument in response to the movement of the foot pedal. The means for providing an optically transmitted signal comprises a plurality of individual light channels.

Abstract: The illumination system has primary and secondary light sources with a lamp current sensor control circuit for automatically switching from the primary lamp to the secondary lamp in the event the primary lamp fails. An illumination directing mirror is positioned between the light sources and directs one or the other of the light sources towards a fiber optic cable. The lamps are mounted on a movable carriage which is remotely controllable by a pneumatic cylinder. The carriage moves to alter the distance from the lamp to the port of the fiber optic cable. This controls the intensity of illumination entering the cable without changing the color temperature of the light.