Looking around various suppliers, eg

http://www.marubeni-sunnyvale.com/uv_lamp.html

none make explicit warnings about LEDs, particularly any
requiring warning labels, eg

http://www.atlanticuv.com/safety.htm

To be honest, I've had one or two nasty moments with ultrabright
greens. They are just nasty, but aren't labelled as such

===========================================

This supplier doesn't sticker the small units, but does the larger
ones, implying that if a sticker was needed for the small ones, it
would be there

http://www.maxmax.com/aFlashLED_SubMini.htm

http://www.maxmax.com/aFlashUV4Watt.htm

===========================================

The worry is generally with length and degree of exposure. Sunlight
is probably the most potent source of UV, especially UVB and UVC
and even that takes some prolonged exposure to before health would
be affected. Your artwork will be visible because the UV has been
transformed into visible wavelengths, but it's hard to say what level
of UV reflects unaltered - I'm guessing not much. Compared to an
arc welder (which is quite easy to get flash burns from) or a germicidal
lamp, I'd have thought LEDs wouldn't be a concern in a setting such
as your. But I'm not a doctor or FDA researcher

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