Out of curiosity, I measured my scanner's bulb's light spectrum (spotread -a -H), at night, all other sources of light turned off. It was quite interesting. (Closest standard illuminant would be F10, but there's significant differences.) Is there anything useful that I can do with this spectral data to improving the color accuracy of my scans? I looked at the colprof, spotread, and .SP file documentation, mostly having to do with the -i switch. I'm thinking this only has to do with illumination on the output side, not the input side... But want to make sure I'm not missing something! I'm thinking the profiling process effectively makes the bulb's spectral data irrelevant... By comparing the values given by the scanner to the spectral data of the target, it basically takes the bulb's spectrum out of the equation, right? (Obviously without removing the limitations of the bulb's spectrum like there's an extremely small amount of 520nm light, so there's going to be trouble there.)