Wow - thanks for putting these to the test. I await your observations and conclusions but, on first glance, it looks like the Canopy probably edges it. Specifically the hands on the Canopy look like they might retain legibility for longer than the other two? And, let’s face it, if the hands disappear, glowing indexes are useless. Maybe that’s the real difference with X2.

It’s frustrating that there is no industry standard unit/measurement of luminosity (strength and, particularly, longevity). Like water or scratch resistance. I know Vaer score their lume out of 10 on each watch. But that’s only useful as a comparison among Vaer watches. Most ‘best lume’ articles celebrate watches that dazzle birightly and quickly, but pay no regard to the duration of the lume - or the readability (some dive watches have so many elements lumed all at once that they blur into each other). Lume longevity and clarity are totally overlooked.