I just ran my first serious end to end test of my (still primitive) spectral renderer. I turned to the trusy Macbeth color checker (data from BabelColor which Brian Cabral turned me onto). I used Chris Wyman's approximations to the XYZ tristimulous curves and they were so much more pleasant than typing that junk it. This is the chart with just a uniform background(lambda) = constant and no lights. Looks like it all works fine. This was a great test case (which is why everybody uses it for spectral work) and it shook out several bugs.