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Ive always liked Trijicon night sight. Bright, but not overly bright and the tritium works in nearly no light.
I have been searching for quite some time for actual tritium paint but have not been able to find any for sale, both in brick & mortar shops and the Web. Maybe it is a radiation hazard or something along the lines, I am not too sure. I have done numerous work on sights and also turned the iron sights on my SAA revolvers 'dark capable' with phosphorescent sight paints which are readily available.
They work very well and in low light conditions, give off a very clear indicator. However, unlike tritium, these paints are 'light activated' and do not carry their own energy source. Rather, it takes a short exposure to light to get them to kick in. I have found that they work even with a few seconds of exposure to an LED flashlight. But, if an emergency arises, let's say, at zero dark thirty and you need to achieve instant target acquisition in near pitch black conditions, that WILL present quite a problem. 'Charging' a sight will be the LAST thing you want to do when you have to clear a room or prepare to shoot at any given second.
Like @Strykervet said above, sights are personal. They can and will mean life or death when you need them. If tritium paint is not offered for sale commercially I am going to have to invest in aftermarket sights. I am always a stickler for being prepared and shooting in dark conditions is something that is often easily overlooked in the subject of defensive handgun use.
Not to shoot your bubble there but tritium paint likely isn't available. Radium paint USED to be available, but they pulled it from the market when young women's jaws started falling off. It's highly radioactive and it mimics natural elements our body uptakes. I forget which one off hand but the typical culprits mimic calcium, potassium, etc., and are taken up as fast if not faster by the body.
If a lamp is broken, it's supposed to be put in a plastic bag and disposed of properly. Those sights have tritium gas inside the bubble and they don't typically break easy, are shock isolated. I have a set with one lamp broken, but the lamp itself isn't broken, just the lens. But it does expose the lamp.
The tritium in the larger sights and scopes is in a glass vial that goes in side the unit. These can be had for replacement, but I'm not sure about the laws. It's legal apparently to import small amounts of tritium overseas provided it's sold in a sealed end use product, typically sold as glowing pendants for keys. The vials inside though are the same size as what's used by Trijicon only made in Chinese reactors. Good luck buying replacement tritium here, I tried a while back and US Nuclear just didn't have any and didn't have a date for when the reactor would be fired up to produce it. That was years ago, but if you can get it from US Nuclear, I would go that route. That, or just send back to Trij. For $20 to replace lamps, can't beat that. And I think they or another operation will repair other brands too.
Good luck, stay safe!