What wavelength do UV florescent tubes put out (the 'black light' kind, not the
UV EPROM erasers)? They seem to be usable for hours at a time without ill effect
(at least in disco's <G>).

Are you expecting people to be staring at tehm for hours on end? I suspect
the exposure level would be quite a bit less than what one gets on a sunny
day.

Can you put a UV opaque coating on the crystals? IOW, plain old sunblock.

R

Darren Gibbs wrote:
>
> Howdy,
>
> I'm working on an art project that involves illuminating large quartz
> crystals with colored LEDs.  We've discovered that UV LEDs produce a
> most beautiful effect, but we're unsure how to gauge the danger.  The
> LEDs specs say that peak power is at 405nm, (400-410nm range).  After
> quite a long time searching the web, I can't find definitive safety
> info on 405nm light.  Some suggest that it's outside of the dangerous
> UV-A range (though only barely), other sites warn of damage from all
> wavelengths less than 500nm.  Does anyone have any ideas or pointers to
> trusted resources.  Better safe than blind!
>
> thanks,
>
> darren

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