The Fisher Micromaster is probably a pretty good deal for you. Each microscope has a specific type of bulb that they use. Very seldom, can you replace it with another. I know of certain instances but they are few. In the case of this Fisher microscope , the bulb is half silvered on the bulb envelope, which acts as a reflector. Usually, microscopes are sold with a spare bulb, in the kit, so it looks like the microscope is still fitted with the original bulb and you would have a spare, included. Microscope bulbs have a life of around 200 hours.
The bulb for that microscope is an s74015, 115v. 15 watt. It may be unique to Fisher. They are $8.40 from Fisher but then shipping would be on top of that. Similar bulbs are used in Olympus , NIkon and other microscopes but they are 120v. 20 watt. They would work but the extra heat might be too much. You could probably use an unsilvered bulb that was similar and make a reflector under it of aluminum foil but one would want to have the heat generation checked by someone qualified. The reflector in the bulb would reflect both light and heat, so whatever is under the bulb would need to be protected from any extra heat a modification would entail.
However, there are numerous led options available now with that type of base, which is a ba15d type base. You could get one of those as a 220v. version( I would recommend getting 2, because even leds fail) , change the plug to fit your mains and switch directly over to led. A 3 watt would likely be adequate.
Here is the ebay page with many options in length and various diode types and arrays.
https://www.ebay.com/sch/i.html?_odkw=b ... acat=20706