tritium question

[second amendment]

curious as to how long that stuff lasts and what do you do when it dies out? Is the scope useless at that point?

tia

[Glockerman]

Tritium has a half-life of about 10 yrs. So 10 yrs from when that batch was made, it will be half as bright-but may still be usable. 10 more yrs. and it will be half as bright again-being 1/4 of the original brightness. As long as the scope has some type of reticle-it'll still be useful during the day. Don't know about replacing tritium vials. Maybe if returned to manufacturer, they could do it?

[Vampire]

Green and yellow sights are warranted for 12 years. The orange lamp only carries a 5 year warranty.

http://www.trijicon.com/

[Mark Ducati]

My 1989 SKS has some tritium rear sights... they still glow!

M.