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 seller, 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 or may not be a measurement artifact.

* 1.95" Round UV "Woods Glass" permacolor dichroic glass filter, Rosco 33650-7495 from stagelights.com.