Someone may have posted this question before and I have missed it. If so, my apologies. Please direct me to the correct link. If not, could someone tell me what the visible difference to the average eye might be between 130 lumens vs. 180 lumens, or 180 lumens vs. 220 lumens. In a test environment (totally pitch black) I could see the possibility of a huge difference, but my question references real world environments (city, night dog walking, hiking trails at night, etc). I also realize that this question might, at first, appear to be a bit ambiguous, but I am curious as to CPF members thoughts on the topic.