Welch Allyn Replacement BulbsA range of replacement bulbs for Welch Allyn Otoscopes and Ophthalmoscopes.Deciding on which replacement bulb you require is easy:Firstly remove the old bulb from your Welch Allyn instrument head.Please make a note of the Welch Allyn product code that will either be printed on the side of the bulb or moulded into the base of the bulbUse the product list above to cross-reference the Welch Allyn code with the Williams Medical Supplies code