Paul-
I too would recommend the US Lighthouse Society. Their
address is:
244 Kearny Street, 5th floor,
San Francisco, CA 94108.
Their phone number is:  415-362-7255

As far as non-glass Fresnel lenses, I just came across
an ad for a company that makes Acrylic Optics.
Apparently they can be custom made for whatever your
needs.  The contact for that company is a man by the
name of Roger (no last name given).  You can reach him
at:  863-688-9355 in the evenings.  Mailing address
is:
1720 King Ave.
Lakeland, FL 33803

Hope this helps!
Missy

--- Paul Orselli <[log in to unmask]> wrote:
> Does anyone have (or have a possible source for) a
> large Fresnel Lens of the type used in Lighthouses?
>
> This could be a glass original or a reasonable
> facsimile.
>
>
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