I got a "380 385 nM UV
Ultra Violet 32 LED Blacklight Flashlight" from ledwholesalers.com
I am always skeptical of any specifications from an Ebay
but in this case, the LED output did indeed peak between 380 and 385
nm. The light had a noticible amount of
visible also, so I tried putting a UV-pass filter* in front of it. That
did reduce the visible part of the output by a useful amount.
There was also a small IR peak at 770 nm (2 x 385) which may
may not be a measurement artifact.
* 1.95" Round UV "Woods Glass" permacolor dichroic glass filter, Rosco
33650-7495 from stagelights.com