Versions 3.7.0 and earlier of POV-Ray don't support Fresnel highlights 
for non-metallic objects.  The attached program is an attempt to find 
reasonable specular highlight compromise values for glossy non-metallic 
objects.

In version 2.0, the formula is updated to cover low IORs, and low IOR 
test cases are added to the scene accordingly.  The formula breaks down 
at IORs above 3.0 or so, but there are not many non-metallic materials 
with such high IORs.

If you are using POV-Ray 3.8 or later, you should use finish-level 
Fresnel instead of consulting this program.

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Attachments:
Download 'hilite_compromise-2.0.zip' (2 KB)