please share a link to your review here when it is ready, I always enjoy reading your thoughts.
Now an observation about lumens vs brightness within a small area
I can turn on my 140 lumen mode on the Folomov, and the hotspot is so wide, that the illumination I see on a painting on a wall 20 feet away, is similarly bright as the illumination from my HDS at 37 lumens.
that is to say, 37 lumens on a 3 food diameter hotspot, is roughly equivalent to a 6’ wide hotspot at 140 lumens.
that is what makes HDS lumens seem brighter, they are focused into a smaller area. This small hotspot in HDS, makes for a very efficient runtime ratio, because it allows the use of lower lumen levels.
The HDS beam is optimized for longer runtimes, by focusing on a small hotspot. This increases the throw of an HDS style beam, in contrast to wider beams at similar lumen levels, that will not throw as far.
In many ways, the HDS is optimized for use in a cave, where there is little color, and no ambient light. Ultra dim modes are useful in fully dark adapted situations, and a focused beam is adviseable, to see into the narrow tunnels one might need to crawl through, without overlighting the visual near field of the walls.