I'm not sure about all that. There are two kinds of "night vision": thermal imaging and light enhancement. I got to play with a high end therm a while back .. vehicle mounted, not hand held. For giggles one of the peeps went out about 20 feet and shined a flashlight at it. The flashlight was visible to our eyes, of course, but through the therm, we saw only his shape, no light from the flashlight at all. A little uncanny IMHO.
Working from their avoidance of trail cams, I'm fairly sure bigfoot see in I.R. at least a little farther than we do. Thinking about that, I wonder what the heat of a campfire or gas lantern looks like to them compared to how it looks to us? Could be pretty wild, huh?
I'm not sure they see better in the visible spectrum than we do at night. I was really surprised at the level of detail visible through the thermal imager at short to medium distance. I could see enough to identify specific people. I could see the cracks in the pine tree bark by the road. Pine cones hanging from the trees. Up close, I.R. may be enough, no need for more sensitivity than we have in the visible spectrum. They MAY have it, but I just got "schooled" on whether it was necessary or not and I thought I'd share that lesson.
At the same time, yeah, they are sensitive to bright light at night. So are we. How do we measure how much more or less so? What responses of theirs are conditioned that we might misunderstand? What responses of our own are "taught" vs how much is truly instinctive? (Do Russian kids cuss in English like I do when I stub my toe? No. So ... some of response IS taught, not pure instinct. Flinching, hands to the face rather than just squinting, etc.) There's a cultural / learned relativity we don't have sufficient basis to measure .. yet. (Tangentially, by the time we do, they may have learned / changed responses just from watching us ... or even vice versa, the old quesiton about who is habituating whom?)
Interesting stuff!
MIB