RussellMc wrote:

> 1. Use of a UV LED as a UV detector has been suggested.  Blindness to
> visible light would depend on their filtering of the output.=20
>=20
> 2. Orion Semiconductor of Hong Kong make a Gallium Nitride UV sensor
> said to be suitable for UVA UVB UVC but 'wholly blind' to visible
> light. I was interested in it for a project that didn't (or hasn't
> yet) eventuated.

Maybe I'm missing something, but Dwayne said that the false triggers are
outdoors. It seems to me that it may not help much if a sensor is blind
to visible light -- that's not the only radiation present outdoors.
There may be enough UV to trigger a UV sensor -- or so the vendors of
sunscreen products try to make us believe :)

Gerhard
--=20
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