This LED illuminator replaces the original Olympus BX50 or BX51 EPI Illuminator. Provides a whiter, brighter light than the original, while using far less power. Intensity control is continuous from 0-100%. Since the illuminator is at the top of the microscope, is is easily accessible, and the normal location for the intensity adjustment pot is on the main illuminator body. Contact us if you want the adjustment located elsewhere.