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I got a used Convoy UV flashlight, that supposed to have a Nichia emitter,

Not sure what it the exact source, it looks a little banged-up so possibly from Bangood :sunglasses: , not sure though.

Anyone knows if all of these Convoys take the same size of the UV filter? And where should I get one or two for cheap?

If I got it right the diameter is 20.5 mm and thickness 2 mm, but that is a total guess.

I would appreciate any suggestions.

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this one

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Lately ordered for “Convoy S2+ 365nm Nichia UV Waterproof LED Flashlight” bought from gearbest and it fit perfectly

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Just do a search on Ebay for “ZWB2” 20mm (20.5mm actual size, but 20mm fits fine). Just checked yesterday and found one for $0.99 (not posting link because they change all the time). Then again, why not: https://www.ebay.com/itm/ZWB2-Ultraviolet-UV-Band-Pass-Filter-Diameter-20-5mm-Thickness-2mm/263374354991?hash=item3d5255ba2f:g:7kEAAOSwsYpaKjFM