Hi Philip,
No, the color in the picture were not photoshop-enhanced. The reason why the red color appears so saturated is because this american lamp has a phosphor coating of magnesium fluorogermanate instead of today's europium phosphovanadate. The former absorbs blue light and has an emission peak lying in the mid-far red region , namely ~700nm, while vanadate radiates in the near red 612-620nm, giving a more pinkinsh overall color when combined with the blue emission from the mercury discharge.
The problem I was faced with was that the run-up period of this lamp was too short for a good picture to be taken. So I used a transformer that forbade the discharge from shifting to higher pressures and kept the lamp in a steady regime as found during run-up.
Best regards
Max