I can say with 100% assurance that I've used pan and color film in my old Brownie and my dad's Monitor, which both have red windows. The Brownie Starflash was kept in bright room light sometimes for months with a roll in it, and many times in bright sunlight. Never any fogging at all.
Somebody on one of the other boards was saying, when this topic came up, that Kodak actually had a couple models with a dark green window instead, which is the color that Pan film is least sensitive to.