Voltage 2.5, Base 1 PIN, Shape T1.5, Overall Length (mm) 15, 11.405, 2.5V Clear, Manufacturer: American Optical Reichert/American Optical - 11400H Ophthalmoscope - 11.405 Replacement Light Bulb - Equipment to Lamp - 11.405 - 2.5V Clear - Manufacturer: American Optical