What exactly are you looking to illuminate with this light? Are you lamping things? Hunting predators/prey so want a tinted light? Illumination for night vision? What sort of range are you looking for? What sort of price range are you looking at? Do you want a direct mount light that attaches to a picatinny rail or something you'll grab with a scope ring? What sort of batteries are you looking to run? There are so many different directions this can go. From cheap china zoomies like this: https://www.aliexpress.com/item/32819021933.html
And all this is before you even dip your toes in the land of limited production, custom, etc flashlights which can be pretty much anything.
I will say though that, as a generic piece of advice if you don't know what you want and don't want to spend a lot of money, one of these clamps with one of the above referenced zoomable lights will cost you less than 20$, won't require special batteries, and will get you a surprising amount of performance. Burn one out, or want a different color? Its only another 10$ to get a whole new light. It is an easy way to get a decent performing light onto your airgun until you figure out just how much you'll use it, how much performance you need, run time, and any other performance requirements you might have. https://www.aliexpress.com/item/32894188922.html
I hope that helps and/or at least helps set you up with the right questions to find the light you want.