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Discussion Starter · #1 ·

I was just playing with a torch and my Seiko SKX007 while waiting for my son (dad's taxi) and wondered if I keep doing this again and again and again if it will eventually get less luminous. Or if it's just after 10 or 20 years that it fades.
 

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Tritium lume will degrade over time. My 7548s and 7C43s no longer glow very well. However, Seiko's modern proprietary lume, i.e. Lumibrite is strontium aluminate, which is non-radioactive. Therefore, it is hard to see how this would degrade, unless it is chemically unstable. As far as I can tell, strontium aluminate is pretty stable chemically, thus it should remain highly luminous, when excited by light, for many years.
 
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