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You'll most likely be safe with anything labeled as using Superluminova Lum technology, C3 is super bright and long lasting.
If you find a set of hands that you like I wouldn't hesitate to ask the seller how old are, Lum starts to loose it's brilliant glow after about 7 years, that's just normal and some people will keep hands laying around in a drawer for ages.
Stay clear of anything that is Tritium, it's a radioactive compound, that's then mixed with paste and applied to hands. All watch companies used to use that stuff before Lum was invented, these hands will be at least 15 to 20 years old because that's around the time it got banned in production.
Interesting thanks @Antidotes and @Stonehedge .
Had to get the bus/train/bus to collect a bike box, and on the way back swung by my mate at work. Popped the old crystal+cyclops out the Stendardo and replaced with a 2,5mm mineral by Sternkreuz. Looks so much nicer now though it's still a low end watch by this thread's standards.
Anyway, it's a 0S10 Miyota inside, the allwatchparts site says those hands are 120/70/17(26) .
Not sure I want to lose the sky-blue chrono, but keen to replace the hour and minute hands with modern lume. However, money, so what are my options away from Merc cathedrals? I see a few baton style hands on ebay but risk the lume being old and inefficient.