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Treehugger
Ok, I should explain how it works on the HiPER app.
Basically, any number you type into the calculator at once, if you press the 'CONV' button there's a menu that gives you a list of possible options, so you would choose 'millimeters', THEN AFTER THAT, the screen shows associated measurements in various standards, like inch and feet and who knows what else, lots of this stuff. E.g 1050mm = 41.338.. inches. Width of kit's searchlight = ca 3mm. 3x350=1050mm or ca 41 inches.

If you needed to change your initial imput, this number you typed in at the start, you can simply edit your existing number from the conversion screen on top, and the calculator immediately recalculates the other conversion numbers numbers.

I had some difficulty figuring out which aftermarket 'searchlight' product I wanted, as the product page onlys states inches not actual measurements in mm, and so I had to resort to a photo to figure out which what it was supposed to look like. The 44" looked like a match and sort of similar to my kit part, just a little wider. And so I think there's the 44" searchlight on at least one of the Dido light anti-air cruiser I saw in a photo. None of the other 3d-printed searchlights matched.