A mains electricity (AC-powered) device that is exclusively designed to provide a microscope with an external source of light to light up the viewing field which may be, e.g., directly under the magnification system (a slide) or a field of surgical intervention. This device may be a simple lamp, or utilize fibreoptic cables to carry a cold light forward to the site. This device is not built into the microscope and must be identified using this GMDN code. If the light source is built-in, then it shall be considered as part of the parent device and the product identification will then follow that of the parent device.