Welch Allyn WA-03800 Compatible Bulb Lamp 03800, 3800, WA03800,WA-03800-U T2 Halogen Bulb for Panoptic Series Opthalmoscopes Provides same Form, Fit and Function as OEM product Used in Welch Allyn 11800 Panoptic Ophthalmoscope Welch Allyn 11810 Panoptic Ophthalmoscope Welch Allyn 11820 Panoptic Ophthalmoscope 03800U , 3800U , 03800-U