I originally approached various companies with regards to getting an LED light source for my Leica DMLB microscope. The fact that the microscope was old and had a mechanised stage meant that some of the LED systems that we looked at were unsuitable to be fitted. Thankfully the CoolLED system simply slots in where the old mercury bulb unit used to sit. It took less than five minutes to fit, and was ready to use once it was switched on. No more waiting for the bulb to get to temperature, no more bulb changing, or re-calibrating of the mirrors before use. Simply marvellous!