Actually, Tritium has a 12 year useful life in the green color. Less in Blue, Yellow and Red as used in gun sights. Dennis

I did find out that you get watches and other stuff that use tritium and phosphor to light up displays (life time is about 2 years on the tritium), but the real issue here is that I need a really big laser to start off the fusion reaction I wanted to try as an alternative to Li-Poly batteries, and it  just weighs too much
 

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