[dorkbotpdx-blabber] science question: spectrascopic measurement?

[Mykle Hansen]

hi,

another Lightbar-related request for help: there are "wide-spectrum"
bulbs, and mixtures of different bulbs will also help spread the  
spectrum
of wavelengths in LIGHTBAR, but how does anybody really know just
what light they're looking at?  it would be cool if we could rig
up some kind of spectrometer.  i know how to do that for one direct
light source (using a prism) but how would one take a spectral
measurement of the ambient light falling on a point from all
light sources?

-m-
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