Excellent post, Fletcher. Thank you. It confirms what I've experienced over the years. Intensity is more important than color. I would like to add that people who are astro-imaging don't really even need to be truly dark-adapted anyway. Keeping one's eyes at maximum sensitivity is advantageous for the visual observer who is working at the very limits of a particular telescope, or doing unaided-eye observing, where a fraction of a magnitude can be critical to noting a detail, or not. Someone who's primary motivation is taking images or data need not be overly concerned with it. The fact that you are spending most of your time looking at a screen and not an eyepiece, obviates the true requirement for deep dark-adaptation anyway. So, don't worry so much about it if you don't really need it. It's not a priesthood and nobody is going to rat you out to a higher authority if your flashlight or headlamp is just a tad brighter than your buddy with the 24" Dob and a copy of the Millenium Star Atlas might think necessary. ;o)