Messages

Subject:
Spectral properties of light *PIC*
Response To:
Re: Maybe . . . ()

Bill Tindall, E.Tn.


Picture 1 shows the light distribution of incandescent light(3000K line), light generated by anything hot like a filament. There is some light at all wavelengths but the light is biased red with very weak blue. Picture 2 shows the light distribution (spectrum) of a high quality fluorescent lamp with terbium and europium phosphors. If one of these spectral lines reflects back from the colored gem, colored because it absorbs certain wavelengths of white light, I can see where the appearance would be more intense than when viewed under incandescent light. Picture 3 compares various light sources.

In the case of diamond what is desirable is to reflect back white light, ideally from a point source like a halogen lamp.

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