[scuttle]

The gas tubes are not as bright as lumed material, but they have the advantage of not needing light to charge them so what you see is what you get for at least 10 years or so. After that they will eventually fade to black as the radioactivity decays.

The lume will stay constant through the night - but it will decay, year by year, during the first 10 years. It may even go completely - I had a Nite tube fail completely when it couldn't have been even five years old. I'd only consider tritium tube illumination on a cheap watch that I'd be ok disposing of if the lume decayed.