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Geologist said:How long should the tritium last?
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Forever, maybe even longer .-)
It just gets dimmer. I do have useable tritium lights more than 20 years old.
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powernoodle said:The half-life of tritium is 12 years, so in 12 years it will be half as bright. But there is always some delay between the date the tritium is manufactured and the date it arrives in your mailbox, so that needs to be taken into account.
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It does not matter when it is manufactured, it just goes down to half what it is now in 12 years. Assuming the phosphor is acting somewhat linear.
Of course there is no way to conserve it.