The Dolan-Jenner BT-636 is a boom stand microscope light source that features a flexible and adjustable arm, a movable head, a heavy-duty cast-iron base, and dual halogen lamp illuminations. It is easy to set up and use, while offering a wide range of illumination options to accommodate various darkfield, brightfield and florescence applications. The BT-636 also has built-in dimming capabilities, allowing users to adjust the intensity of the lights. It is also designed for long life, with components designed for a minimum of 50,000 hours of operation.