One thing with watch faces using tritium vials for illumination, the vials have a life of roughly ten years, they get gradually fainter over time, (ha, see what I did there?), which may be an issue. To be fair, though, most watch lume seems to get fainter as it gets older, my Yema, which is now nearly 50 years old, will glow for an hour or so, my 30 year old TAG night diver, which has a fully luminous face with extra lume on the 12, 6, and 9 markers will glow brightly for a couple of hours but is almost impossible to read after three or four, but my Seiko SPORK, which is about seven or eight years old is still clearly visible after seven or eight hours. It’s got one of the best and clearest faces around.