Watch Glossary

Residual luminescence visible on watch dial after primary glow has substantially faded

Modern luminous coating like Chromalight that glows blue, offering superior brightness and duration

Level of brightness emitted by luminous dial and hand coating in low-light conditions

Time period during which watch lume remains visibly luminous after light exposure stops

Traditional luminous material that glows bright green in darkness, common in vintage and modern watches

Initial intensity of luminescence immediately after light exposure before degradation occurs

Visual difference between luminous and non-luminous dial areas visible in darkness

Gradual loss of luminescence brightness and duration in watch hands and dials over extended time

Duration and persistence of a watch's luminous glow, measured in hours of visibility in darkness

Consistency between luminous brightness levels on dial, hands, and markers in darkness

Aged appearance of vintage luminous material showing discoloration, yellowing, or browning over time

Photograph of a watch taken in darkness showing the glow of luminous materials on dial and hands

Consistent application of luminous coating across dial ensuring even brightness throughout

Measure of how brightly and for how long a watch's luminous material glows in darkness

Gradual reduction in luminescence brightness of tritium-based watch dials at approximately 5.5% per year

Natural aging process causing color changes and degradation in old radioactive watch lume over decades