Light guide techniques using LED lamps - brilliant

This HP/Agilent application note has been referred to by several 
people in the last few days but was so buried in a thread that it's 
liable to be missed. This is a brilliant (pun intended) 22 page PDF 
that tells you how to get light from LEDs (and other light sources) to 
go places and do things that you will almost certainly want it to go 
and do at some stage.

        http://cp.literature.agilent.com/litweb/pdf/5988-7057EN.pdf

This is a far more complex subject than may at first meet the eye 
[:-)] and the paper is well worth reading.


        RM

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