Zebralight H501 listed as DISCONTINUED on ZL's product comparison list

[eh4]

Human eyes see increases in brightness quite differently to light meters. There are a number of quite technical posts around covering this much more accurately than I can, so find and absorb them if you want precision. What I will say is that all else being equal (beam pattern, distance, tint etc) a doubling of lumens only looks a bit brighter, nowhere near twice as bright. Unless you can compare them side by side at the same time, most people would have trouble distinguishing a difference of 25% in lumens. Throw in different emitters with different beam patterns and it is much harder to do a comparison just by looking at the specs for two different lights.

Yep, I subjectively, non scientifically second that.
Also, if after agonizing about a choice here you get a light and eventually decide that it isn't exactly perfect, it'll still be so much better than a hardware store impulse buy that you'll love it as a back up or as a hand me down for a deserving friend once you find the next "perfect" light.