On the forum, many people have a tendency to criticise lume of the watch. So I Googled the topic and here is what I found.
The test standard for lume brightness is ISO 17514
The standard mentions that a tested lume has to be applied in certain thickness and be charged under D65 light source anywhere between 20-30 min.
200lx for 30 min, 400lx for 20 min.
Then brightness of the lume is a function of the humidity and temperature as well.
So the moral of the story is that not all SuperLuminovas are the same. Next time you buy a tool watch, the questions to ask, the thickness of the applied lume and if lume is applied in a controlled room environment or preferably environmental chamber rooms for best results.
Given how watch companies are very secretive, the best defense is educate oneself.