B wrote:
Is a "Sodium Vapor" light the same as a "High Pressure Sodium" light? :-)


I remember an experiment with, what was called, sodium vapor
lamps on a street west of Chicago about
40 years ago. There were very orange .... like a pumpkin.
The high pressure sodium lamps of today do
have some other colors present to make them less
objectionable, i.e.whiter (but not much). I know this
probably doesn't answer your question, but one could draw
some parallels and hypotheses.