An endoscope is disclosed that provide selection of each illumination mode of four different illumination modes, with one of the four different illumination modes being a mode which sequentially transmits very narrow wavelength ranges at three different wavelength regions within the visible spectrum...http://www.google.com.au/patents/US7704206?utm_source=gb-gplus-sharePatent US7704206 - Endoscope that provides selection of each illumination mode of four different illumination modes
