Wonder if it’s a good idea to have an AA/AAA/CR123 host with tritium as a light source and a reflector. 10+ yrs of low glow light. Water proof and don’t have worry about topping the battery off. I would love to buy one.
ultra moonlight mode flashlight 
Photon fanatic used to sell tritium “flashlights” with tritium spheres as the light source
You think it would be useful? I never own anything with tritium before. Doesn’t really know how bright it is.
Enough to read, there were tales on CPF of people using these (typically a luce de notte with an 18mm tritium sphere by photonfanatic) as bedside table house navigating “lights” (you would really need to have a pitch black house and excellent eyes)
Betalight b.v, the makes some tritium lights but can be quite expensive.
18 mm sphere is the smallest size to have enough light to barely see something in front of you. I wouldn’t use this as an emergency light. Considering the price, the fragility, the danger if you break it in a non-ventilated place, the fact that you can’t have it in reach if you have children, IMHO, a simple E01 (or so many other other choices…) and a couple of lithium cell would make a much better emergency light…
But, if you have a reliable light with a mounted tritium tube on it, that’s the best you can have. However, don’t expect to be able to use the trit as a light source, it’s strictly to locate your flashlight in pitch black.
Thanks guys
Yes, no
(even if you break a tritium source and be fast enough to actively inhale the gas before it disperses, the amount of radioactivity that is internalised is probably so low that if you get cancer from it, it can statistically not be attributed to this event)