Thanks for the suggestion - its well out of the class of what I'm
needing for the present requirement but looks like a very useful
device. I'd be interested in your conclusions re reflectors and what
reflective coating you ended up using. (I have a somewhat dated but
useful paper on various reflector materials if you are interested, -
Silver on Acrylic with Acrylic top protective coating is the best at
about 96% but Al on Mylar with no protection is close  behind.

The Taos light sensors look very useful and their dual diode solution
to avoid using a selective filter merits a better look.

                 http://www.taosinc.com/default.aspx

So - thanks again for the suggestion, and it looks like it may produce
some useful leads for other purposes.


      Russell
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