> In response to John Lupien:
> >Over-simple, really. You appear to have left half of the non-visible
> >spectrum out of your model. Perhaps there is less UV emitted, more IR,
> >and more visible? Then you'd get more heat, more light, and not quite as
> >good a tan...
> I think that the assumption that light bulbs emit a significant amount of UV
> is rather doubtful. Since less than 10% of the energy is emitted as visible
> light and the vast majority of radiation energy is at lower frequencies (IR,
> etc) I rather doubt that there is significant UV emitted by either normal or
> halogen bulbs. Only discharge lights emit UV (and then only if the gasses in
> the discharge path are optimised for this).
I have no problem with your expanded analysis, it was the original
message indicating that if there is more visible light, there should be
less heat for the same power input. Thanks for elaborating on your "simple"
model!
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John R. Lupien
lupienj@wal.hp.com
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