Table o Contents for the impatient:
0:00 - Intro
1:40 - 1. What is Tritium?
3:23 - 2. How does it Work?
4:20 - 3. Safety
4:52 - 4. T25, T50, and T100
5:33 - 5. How long does it last..

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Presenting my most boring video to date. A mini lecture on Tritium, specifically on GTLS: Gas Tritium Light Sources. Also known as Tritium tubes, inserts, lume.
It's everything you need to know before looking to buy something with Tritium, and maybe a few you don't.