>> Can anyone provide an authoritative comment on this or, 
>> failing that,
>> hazard any half likely guesses.

> Even illumination of a flat surface -- in particular, 
> backlighting?

Is that an authoritative comment or a half likely guess :-)

FWIW, my prognostications suggest that for my application a 
1/COS^3 wrt angle from centre response is desirable.

Plotting that against Batwing out to around say 60 degrees 
gives a suspiciously similar if not identical result :-).



        Russell 

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