I thought I said for pan films, but it turns out I only mentioned it not being good for them. Sorry for not being clear, I often have that habit.Did you mean orthochromatic films? And why would you use green safelights for orthochromatic film?
Actually, using an incredibly dim green light allows for short adjustment times for the eye, which allows for rapid inspection of pan films to check development. Green light for ortho would be bad indeed.
For ortho, red is good, and for the old blue only films, a green light was used as the eye adapts quicker to green. Of course, for pan films, the distance, time, and brightness are all factors. Developing by inspection is definitely not worth the effort except for the most difficult of negatives, at least for me. Accurately judging densities in the dark is too tricky for me.
Plus, the heightened sense of anticipation in the dark is quite rewarding when you finish without peeking!