A powerful light for viewing surface structures through the microscope. The prefocused 3-lens condensing system provides a sharply defined spot without color fringes. Base transformer is 6-1/2 volt, 2-1/2 amp with 20 watt output. Detachable and adjustable lamp. All metal construction with a plastic lamp insulating housing. Finished in an acid and reagent resistant black epoxy-ester. Choice of 110 or 220 volt model. Shipping weight 8 lbs.