HighlanderNorth
Flashlight Enthusiast
First, I was confused about one thing pertaining to the new model Eagletac G25 C2 MkII. Apparently the box label claims it outputs 1,030 LED lumens and 856 OTF lumens. However, in their online literature they claim 1,180 LED and 980 OTF lumens. Hmmmm... Anyway, I own the previous model G25C2 from Eagletac, and its advertised brightness was approx 770 LED lumens and 670 OTF lumens. These models are only about 2 years apart. Boufght mine 1.5 years ago. Obviously when I read the difference in brightness on turbo I was sort of bummed, naturally, that my not-so-old G25 C2 MKI had been surpassed by such a large margin using the same battery.
But then I realized two things. 1. I dont hardly ever use turbo in any lights over 120 lumens anyway, and 2. I remembered reading that the human eye cant really detect brightness differences until the difference is at least 100% more or less. In other words, I read that if you have a 100L light, and you're buddy has a 130L light, both of the same LED, size, head diameter, etc., and you shine both of them in the dark, you wont be able to detect the difference between the two in brightness.
But then I realized that it makes sense that you should be able to detect brightness differences of less than a 100% increase once you start to compare lights over a certain brightness. Maybe the 'cant-detect -any-difference-under-100%" theory starts to become less viable once you get to lights with much higher brightnesses, such as, maybe, over 500-700L. You may not be able to detect a 45% increase involving 2 lights at 50L vs. 72L, but once you get to 680L, shouldnt we be able to detect the brightness difference between a 680L and a 980L light? If so, how much difference would it seem to be?
I just dont have 2 lights that are so alike, use the same LED and have the same head diameter and tint, etc. yet have brightnesses that are reliably close enough that I can experiment with this. What do you think? Is there much of a noticeable difference between 680L vs. 980L for instance, or are we unable to detect much of a difference there?
But then I realized two things. 1. I dont hardly ever use turbo in any lights over 120 lumens anyway, and 2. I remembered reading that the human eye cant really detect brightness differences until the difference is at least 100% more or less. In other words, I read that if you have a 100L light, and you're buddy has a 130L light, both of the same LED, size, head diameter, etc., and you shine both of them in the dark, you wont be able to detect the difference between the two in brightness.
But then I realized that it makes sense that you should be able to detect brightness differences of less than a 100% increase once you start to compare lights over a certain brightness. Maybe the 'cant-detect -any-difference-under-100%" theory starts to become less viable once you get to lights with much higher brightnesses, such as, maybe, over 500-700L. You may not be able to detect a 45% increase involving 2 lights at 50L vs. 72L, but once you get to 680L, shouldnt we be able to detect the brightness difference between a 680L and a 980L light? If so, how much difference would it seem to be?
I just dont have 2 lights that are so alike, use the same LED and have the same head diameter and tint, etc. yet have brightnesses that are reliably close enough that I can experiment with this. What do you think? Is there much of a noticeable difference between 680L vs. 980L for instance, or are we unable to detect much of a difference there?
