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Richard, this is wonderful! Just the kind of information we were needing. As I was suspecting, "optical red" is one of a whole spectrum of light halos. The color of the halo, if I am digesting this correctly, is determined by the color of the object off of which light is refracting, and the color of what is behind it.
Does the color of the refracted light lean towards the red end of the spectrum in comparison with the color of the object itself in direct light? I have noticed that the atmospheric color, which shows up as an object turns away from the source of light, is usually slightly more towards the red end of the light spectrum than the color of the object in direct light.
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