Tim, Eero, and Alain, thank you so much.

It has taken me some time to read through an understand your replies.  I
didn't realise I could have light values that exceeded 1.0 - don't know but
it just didn't occur to me.  First thing I did was to change my light source
to...

light_source { < 2, -0.5, 0 > 10*White }

Now I have enough light. Actually now I see I have multi-path problems - but
that's another thing, and I want to try and fix that myself.  I may try some
of the other suggestions to. So nice to have choice! There is a good chance
that the will be a combination that will give me just the effect I want.

I have still have some questions related to the original problem, but I'll
take your advice and ask where I can also post the image files.

Thank you once again.

Regards,
Steven

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