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Garth,
Thanks for posting your results with the diffraction grating sheets, they're interesting. I'm hoping to purchase the Lumichrome 5000K, 96 CRI fluorescents pretty soon, I'm curious to see their spectrum too.
You can also take two pieces of cardboard, hole punch one, then tape them together (with the hole now in the center). No light should get through the tape joint (black duct tape works great), and preferably the cardboard would be black on one side. Hold this between your light source and the grating, with the black side facing you. On the grating you'll see a smaller, but easier to look at spectrum, with a nice black background to set it off. You'll probably have to move the grating up and down and front and back, until you find where the spectrum image appears.
I'm glad this was useful to you.
Cheers,
Holly
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