Like most here on CPF, I have read that red light helps preserve night vision. I have also read a number of counterarguments in favor of simply using dimmer white light. The only really detailed thread I recall on the subject is
here. The thread eventually devolved into an argument about the merits of science but before that, there was some good information shared. What I
think I took from it is that, because of the (in)sensitivity of either cones or rods to red light, red light of the same output is less destructive to night vision than white light. However, because our eyes rely on all visible colors of light to see detail,
more red light (higher output) is required to see as well as with a given amount of white light. Therefor, increasing the level of red light to allow one to see "as well" as with white light cancels out any benefit in the reduction of impact to night vision.
For all this to really matter, the relative outputs and wavelengths would need to be very specific and I'm guessing all the light levels in the experiments in the linked thread were conducted at
much lower outputs than we're talking about here with this light. To that end, I'm not sure the impact of white or red light on night vision in the context of normal use of this light would really be perceptible. Whether that is true or not, I don't think the extra size, complexity, and need to click through two additional color modes in the sequence are worth it. Having watched the video, I see that the interface permits the user to jump directly to the low red output (which is nice) but it requires
holding down the button which I just said above is not ideal. In addition, it looks like the interface uses an on-timer which I have never liked. All of this said, it appears the red LED functions as a battery indicator which is one of my favorite functions in newer lights. So maybe it
is worth having the red light for that reason alone. That green though...
Edit: Just an edit to say that Joe and Easily both replied in the time it took me to type out my drawn out response which now looks even more drawn out since they essentially discussed and moved on.