This high illuminance 150W lamp fits inside the standard Sciencetech FB-QTH-3 QTH Fiber Illuminator. It has a 2-pin G5,3 socket, and built-in 50mm dichroic MR-16 reflector. it produces 1,500 Lux and has a service life of 40 hours. Please note that a lower illuminance version but with longer service life with the same socket, working distance and voltage requirement is also available.