One thing that's changed in the past few years is the availability of LED lighting. A red LED, unlike a white bulb with a red filter, is very much just red - there isn't any green or blue part of the spectrum at all. I noticed the difference because you can use very bright red LED lighting as a black and white darkroom safelight. The light could be much brighter than a filtered incandescent bulb because the light was effectively monochromatic. So under just single color LED lighting, everybody is color blind.