I've just snagged a pair of Sofirn SF16 18650 UV-lights. I haven't had a proper UV-light since my 10 year old Streamlight TwinTask 3C (that I've barely used), with 5mm UV-diodes + a halogen bulb. Obviously the TwinTask is now mostly trash in terms of performance.
So after I recently received a Sofirn SF15 2AA UV-penlight, and having played around with it, I actually saw a use for UV-lights in places around the house (though I would have preferred NOT to know that...), so I ordered the SF16 as a more powerful and longer-lasting UV-option.
With the other SF16 on order as a backup, because I like having double of everything I use in case something breaks, and "of course" is no longer obtainable when that happens.