In watch terminology, what does "lume" refer to?

"Lume" refers specifically to the luminescent material applied to watch hands, markers, and sometimes other parts of a watch to make them glow in low-light conditions. This glow is crucial for readability in darkness, allowing the wearer to tell the time without needing additional light.

The luminescent materials used can be various types of compounds, including Super-LumiNova or tritium, which absorb light and emit it in the dark. This characteristic is particularly valued in diving watches or any timepiece where visibility in low-light situations is essential.

Understanding what "lume" entails helps in appreciating how watches are designed for functionality and usability, especially for those who may use them under conditions where visibility would otherwise be compromised.