On a sunny day (Tue, 21 Oct 2008 20:15:03 -0700) it happened John Larkin wrote in :
I wonder which color LED would be most visible to dark-adapted
>eyeballs at very low current.
Probably green (eye curve).
Even cooler would be a couple of those tritium-powered light sticks.
>They're available in the UK and asia, but are for some reason illegal
>in the USA. Looks like some furrin' scofflaws will sell them on ebay
>and ship to the US, so maybe I'll give that a try.
Homeland Safety or whatever it is called will come after you.
You could pulse the 2uA LED for longer life, once a second :-)