<Snipped quote by Haeo>
That's true as well. But gradually lowering light exposure is better than immediate transition from bright to dark (which might actually casue alarm).
Ah, here we have a plethora of truths listed so nicely. But, to all this must be added the consideration of the natural variation in night vision between those of light eye color and those of dark eye color. This causes conditions that are but dim for one with dark eyes to be pitch black for one with light eyes.