Yeah, the issue with tritium is that it's used as a yield booster for nuclear weapons. Increasing the efficiency of a device by a few orders of magnitude. Hence strictly controlled by the US gov.

Night Glow Jeyrings are handy as zipper pulls for Back packs and attaching to Torches to help find them when the lights go out!

http://www.amazon.co.uk/Nite-glow-keyrin...=Tritium+lights

The Betalights are useful for map and compass night navigation, but they are expensive compared to the conventional led lights such as the firefly mode on most Thrunite LED torches for example.

A Betalight would be useful for an HHA Optimizer speed dial sight to read off the range marking for a Night Vision sight/IR laser combo.

Yeah, Firefly is another brand

http://www.fireflymarkers.co.uk/index