The short version is go see this page here.
I’m collaborating on a little hobby project with Andrew Glassner. It involves paint spectra, so we were hunting down a spectrometer. We’d heard good things about ColorMunki, though it’s pricey for a hobby project. There’s now even a $40 spectrometer from Public Labs; they’re located a few miles from where I live.
Andrew decided to ask Golden Artist Colors, Inc., if they had spectra available for their paints. Happily, they did and agreed to release these for free, noting that “spectra are spectra”. This saves us a lot of grunt work and expense, which is great. I felt so good about them that I decided to make a page about their dataset so that researchers and developers could also benefit from it.