Carl Zeiss MicroImaging has incorporated new LED technology in the Colibri illumination system, a light source system for widefield fluorescence microscopy that uses specific wavelength windows with a considerably decreased need to suppress unwanted peripheral wavelengths from a white light arc lamp. The modular Colibri system employs up to four LEDs, without any of the mechanical switching devices like filterwheels or shutters required by traditional illumination systems. The modules can be easily exchanged by a user depending upon the experimental design of the day and makes it possible to implement and exploit further developments in LED technology in the future. With LED technology, users can now take advantage of an alternative for live cell imaging, high-speed or multi-channel fluorescence microscopy, and many other applications. Carl Zeiss MicroImaging, Inc., 800-233-2343, www.zeiss.com/micro