Profile: Photon Technology International, Inc. provides fluorescence solutions. Our products cover many different areas of fluorescence from steady state and phosphorescence, fluorescence lifetimes, ionic detection and fluorescence imaging. Our instruments are used in laboratories for research, health care, industrial process, quality control, environmental science and other applications. We introduce a line of photo uncaging upgrades for the imaging system. We offer the choice of full field illumination, or fixed spot illumination upgrades. Our spot illumination module allows spot illumination of a spot in the center of the field of view. Spot size depends on diameter of light guide, magnification of objective and microscope.