Welch Allyn replacement Bulb 04900, 4900, 11620, 11630, 11720, 11730, 11735, 04900-U Provides same Form, Fit and Function as OEM product Compatible with: Welch Allyn 11620 Ophthalmoscope Welch Allyn 11630 Ophthalmoscope Welch Allyn 11720 Ophthalmoscope Welch Allyn 11730 Ophthalmoscope Welch Allyn 11735 Ophthalmoscope Description Compatible Replacement Lamp for Welch Allyn 04900-U Used in medical ophthalmoscopes 2.52 Watt 3.5 Volt Single Ended Flange Base 20 Hours Rated Average Life TL-1.5 Glass 2950K Color Temperature C-2R Filament Clear Lamp Finish .90 in (22.9 mm) Max Overall Length .31 in (7.9 mm) Bulb Diameter