everything i hear about tritium says it's safe (they use it in watches, too), but you're right, it is indeed radioactive. i understand the concern.
...as far as dim light is concerned, i love multi-level LED lights for precisely that reason. i'm all about choice. when i first started buying LED lights, i was all about brightness. i kept wanting brighter and brighter; the brighter the better. now, i keep wanting lower and lower. i just bought the Quark AA. it has 5 brightness levels. moonmode is 0.2 lumens and goes for 10 days constantly on one battery. i could even use something lower. in complete darkness, you only need a little. the lower the light, the longer your battery life. when i want crazy bright light, i grab my Fenix TK40.
i was all about brightness, now i'm all about runtime. i use only the light i need. that's what i think is amazing about LED technology. it's great how much time you can get on one cell these days.