You might find djozz test with this UV led interesting. LG 365nm UV led tested (LEUVA33W70RL00, from Simon)
I modded a Lumintop Tool AA light with the LG LEUVA33W70RL00 led and used the stock driver which should be putting out around 2 amps.
It could be lower than that given the higher vf of this led over the original xpl hd. Just estimated guess from the original led.
I think I used a filed down 16mm copper mcpcb with the lg led reflowed on. Still has all the modes and the flashy, strobe modes in UV light 
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I really don’t see alot of stray white light, I know all the test show there is more than the nichia NCSU276A but to me it’s not that noticeable.
I got my S2+ with Nichia NCSU276A and the bare LG UV leds from Simon at the Convoy store on Aliexpress. He also sells the S2+ with the LG UV led now.
S2+ UV led history. About Convoy Flashlights | Way Too Cool LLC