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DIY Spectrometer, Genius!
haha, thanks Mello! I can't take the credit for the idea, just replicating it. I think some high school kid came up with the idea for a science fair or something like that. Found it a couple years ago when I was looking at different HID bulb spectrums and came upon Ceramic Metal Halides...
Here is the original thread I started showing how I did it. I was still very new to blogging and forums at the time, so my photo's and description weren't the best.

DIY Spectrometer - Check what wavelengths your lights give out