Not all luminous materials are designed with maximum brightness as their primary objective.

Some models use dark-colored lume formulations to achieve a specific aesthetic appearance in daylight. These materials are chosen to complement the design of the watch and create a more discreet or vintage-inspired look.

Because darker lume pigments absorb part of the emitted light, their nighttime brightness is naturally lower than that of traditional light-colored lume compounds such as BGW9.

This is a normal characteristic of the material and not a manufacturing defect.

As with all photoluminescent materials, performance is also influenced by prior light exposure. Maximum brightness is typically achieved after exposure to direct sunlight or strong UV-rich light sources.

When comparing different models, variations in lume intensity, duration, and visibility should therefore be expected, particularly between watches using technical high-performance lume and those using darker lume formulations selected primarily for aesthetic reasons.