Watch Glossary
1676 horological terms explained
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