As with the above standard sizes, here is what I found in wasting my time tonight:
Concept of Question of the day is something that has an answer either you know or something that can be figured out within a reasonable scope. I take it for granted you don’t know this or if you do, perhaps contact a member of the Senior Team in letting them moderate this defined answer to your scope. Otherwise while there might be a book on light houses, and one can research the heck out of architectural fixtures since the Fresnellens was invented, it’s not within the scope of anyone’s knowledge to win as this section was intended “A Candy Question.” Answer the question, you get a piece of candy.
Stage and Studio fixtures would be hard enough, back in the day I remember even recessed ceiling cans with Fresnel lenses in them - there is no end to types and sizes. Let’s limit the scope to stage and studio fixtures short of your own answer to the question verified that it exists. Surprising also in scope it does not include moving lights with Fresnel lenses that could also be endless to some extent.
Selecon’s Acclaim Fresnel uses a 4" lens, RAMA 7" is 7", don’t know what size lens the Astral Fresnelline is,
ARRI has 2"; 80mm; 112mm; 130mm; 175mm; 250mm; 300mm; 420mm; 500mm
Dooh!!! just deleted a bunch of other sizes including 2" Fresnel sizes.