The important bit is the glowing bit. It emits light, and doesn’t absorb and release it
I’ve had a Traser for years (and it’s still glowing fine), it’s my active watch (normal watch is an Apple Watch, dress watches sitting unloved in the drawer). It’s a fancy one with Chronograph, I’d consider a more plain version if buying again. Often used for trips where I don’t want to charge a watch overnight and where the tritium is handy for checking the time in the dark. Also has a compass on the watch strap so I can go full MacGyver
Tritium watches are great! I’d go for Traser in preference to Nite, just personal opinion. Also see Luminox