Energy storage luminous dial

Is a watch dial without lume a stylistic outlier?

Learn More Luminous material on watch dials — referred to in shorthand as “lume” by both industry insiders and avid enthusiasts — is an element taken for granted nowadays. It can be said without hyperbole that a watch dial without lume is a stylistic outlier in this modern era, but this wasn’t always the case.

What is Lume on a watch dial?

This luminous material on watch dials, shorthanded as “lume”, is one of watchmaking’s most fascinating avenues as it bridges the gap between visibility and functionality.

What is Lume technology?

Let’s take a closer look at the evolution and science behind lume technology. What Is Lume? Lume is a luminescent compound that absorbs light energy and re-emits it in the dark. It’s typically applied to specific parts of the watch dial to allow users to read the time in darkness.

Are luminous dials a compromise?

Luminous dials are a compromise. On the one hand, we would like to be able to tell the time in the dark without dropping a hundred large on a minute repeater. On the other hand we would also like our dials to age well, and inherent in the nature of many luminous materials, is that they will sooner or later dim to the point of uselessness.

Can you use a phosphorescent material on a watch dial?

Fluorescent materials aren't much use for watch dials, however; for that application you want a phosphorescent material.

Why do watch dials glow at night?

The first material applied to watch dials for nighttime luminescence was a paint made from radium with zinc sulfide, which, thanks to radium’s half-life of 1,600 years, offered a long-lasting glow during that period before dimming — the catch being that radium, as its name implies, is radioactive.