Olympus offers a range of LED sources for all fluorescent work, from entry level single colour units to advanced high speed multi-colour systems. It provides the right illumination solution, even for in field fluorescence. LEDs now offer users an excellent alternative to arc burners since they have lifetimes in excess of 10,000 hours, much longer than even the most advanced arc burner system. The Fluo-LED product range introduces additional flexibility to fluorescence microscopy. Each of the three models is designed to fit to the companys CX microscopes making them ideal for routine as well as educational purposes. Further extending this application area is the ability to power the LEDs by battery or even solar power ensuring that fluorescence microscopy can be conducted in field.