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SilverNitrate wrote:Only light source I know for sure that needs no input energies and can last 12+ years is there has to be something radioactive nearby with a fairly low half-life and that can activate phosphors to emit light.
Such example are those tritium or H3 vials made into keychains and watch hands.
But in order to be non-toxic it can't be radioactive, otherwise this will work all too well in the Russian Exclusion Zone.