1. An illumination system for use in an endoscopic device having a rapid duty cycle comprising: a light emitter; a fiber optic cable; an electromagnetic sensor disposed on the fiber optic cable so as to sense light energy emitted from the light emitter; a control circuit in electronic communication with the electromagnetic sensor and the light emitter; wherein the control circuit will control a duty cycle of the light emitter in response to signals generated by the electromagnetic sensor that correspond to electromagnetic energy in the fiber optic cable that is generated by the light emitter