I was passed along this same information by Mr. Breuer of Switzerland, when I was bringing his product into the USA, around 1980. He claimed that his cartridge (a heavily modified EMT ) would not produce accurate bandwidth, unless there was a lamp nearby. Since he lives in Ebbicon, and I in Texas, I had to experiment with the effect of his suggestion. I agree with you about the 72 degrees, or perhaps for my taste, even a bit warmer. I'm sure the specific cartridge design and materials used plays a major role in the outcome.
My current set up employs a ceiling mounted halogen spot, focused on the arm and cartridge. This works well for my current cartridge, the Koetsu Rosewood Platinum Signature. The spot is turned on about two hours before the music session, and after about 30 minutes of groove time, the sound is perfectly balanced and tracking every selection with ease. This bright halogen light is a benefit in setting the stylus in the correct track, as well as checking both the LP and stylus for debris. This is a great topic, thanks Hifiveteran.
My current set up employs a ceiling mounted halogen spot, focused on the arm and cartridge. This works well for my current cartridge, the Koetsu Rosewood Platinum Signature. The spot is turned on about two hours before the music session, and after about 30 minutes of groove time, the sound is perfectly balanced and tracking every selection with ease. This bright halogen light is a benefit in setting the stylus in the correct track, as well as checking both the LP and stylus for debris. This is a great topic, thanks Hifiveteran.