Call me a color weirdo, but I actually have about 6 different light sources in my studio in an attempt to replicate many different viewing environments that my customers may have. In my printing room, I have a strip of track lights with 3500K, 4100K and 4700K Solux bulbs. No windows in this room. In another room I have incandescent floods, outside windows, overhead fluorescents and a few table lamps. It is interesting to move around a print between different light sources, for sure, but my favorite lights to use for my own eyes are the 3500K Solux bulbs.