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^Thats interesting, it makes the point that contrast is enhanced
The article says contrast is enhanced, but it is talking about how the human eye interacts with that light. So it is correct from that view, but a camera sensor does not behave in quite the same way. Image contrast is more skewed than enhanced by LPS light, because the camera sensor is looking for the entire spectrum and does not have the same particular sensitivities the human eye has.
If contrast were merely "enhanced" from the sensor's perspective, then it should (arguably) be fairly easy to make a b&w conversion of LPS-lit images, simply by dialing down the contrast. But the problem is really that the luminance levels of objects in the image are just wrong under LPS light because some things that should reflect medium levels are too high or too low, some things that should reflect little light end up reflecting a lot, and some things that would reflect a lot of full-spectrum light are dimmer than they should be compared to the other objects in the image.
Luminance under LPS all depends on how close to the color of LPS light the object is.
The take-away, here, is that every photographer should have a good BB-gun handy to deal with this issue when necessary.