This Osram 50W/8V halogen light bulb has many uses. The most common use is for applications such as microscopes, projectors and fiber optics. This is a Halogen bulb and has an MR16 shape. It has a rated life of 50 hours and a GZ 6.35 base which means it has 6.3 millimeters between the connector prongs. Applications, Dental, Fiber Optic, Microscope, Ophthalmic, Projection Features.