Check this thread out…djozz tested several uv leds. I built a UV light using a black Convoy S2+, a 1.5a mtn buck driver, and a Liteon LTPL-C034UVH365 led. It only has one mode but I build it for curing NOA61 when installing trits. It can be used with the standard 18650 tube or the 18350 shorty tube. I also used a black UV pass filter. She puts out a lot of nice UV light. I still have a few of those leds and UV pass filters…I’d build you one for cost of parts.
Here’s a couple of pics taken of a public restroom.