Sofirn has an 875mw 365nm one. Wear eye protection.

https://www.sofirnlight.com/products/sofirn-sf16-uv-flashlight-portable-black-light-365nm-sst08-uv-led-ultraviolet-flashlight

Why not just stick a UV lightbulb in a cheap lamp?

UVBeast makes a good one for $40. Found it on Amazon. Solid build, good emitter, 18650, has a USB-C port for charging. Been using it for years to charge up my collection of glow in the dark trinkets.

Not exactly a flashlight, but I got a UV lamp with glass screen protectors that is powered off USB. It is very bright and can be used with a battery pack for portability. Since it came with the screen protectors, it is basically a bonus gift that is more powerful than the UV mode on my Nightcore SRT9.

So if you want to have a great screen protector for your phone and you have need of a UV lamp, going that route may be a great option. I got mine off Amazon, one from IMBZK and the other from amFilm, the IMBZK screen protector is better but both lamps are roughly equivalent.

Convoy?

I have a few UV lights my partner uses for curing resin. She said the one that works the best without smoking the resin is this unbranded 365nm 30W/10W light from Germany, $19.61 shipped: https://www.ebay.com/itm/403994731290

I got it for leak checks. It’s similar to the Convoy (AliExpress) but includes the filter in the base price, was available on eBay and shipped faster, had a 21700 option, and was cheaper than everything else. ABS eyewear recommended.

Edit: added more detail