If your watch has Lumibrite
Lumibrite is a luminous paint that absorbs the light energy of sunlight and lighting apparatuses in a short time and stores it to emit light in the dark. For example, if exposed to a light of more than 500 lux for approximately 10 minutes, Lumibrite can emit light for 3 to 5 hours. Please note, however, that, as Lumibrite emits the light it stores, the luminance level of the light decreases gradually over time. The duration of the emitted light may also differ slightly depending on such factors as the brightness of the place where the watch is exposed to light and the distance from the light source to the watch.
In general, when coming from a place that is bright to a place that is dark, it takes human eyes some time to adapt to the darkness making it difficult to see objects initially. (Dark adaptation)
Lumibrite is luminous paint that stores and emits light, which is harmless to human beings and the environment, containing no toxic materials such as radioactive substances.
<Brightness levels>
|
Condition |
Illumination |
|
|---|---|---|
|
Sunlight |
Fine weather |
100,000 lux |
|
Cloudy weather |
10,000 lux |
|
|
Indoor (Window-side during daytime) |
Fine weather |
More than 3,000 lux |
|
Cloudy weather |
1,000 to 3,000 lux |
|
|
Rainy weather |
Less than 1,000 lux |
|
|
Lighting apparatus (40-watt daylight fluorescent light) |
Distance to the watch: 1 m |
1,000 lux |
|
Distance to the watch: 3 m |
500 lux (Average room luminance) |
|
|
Distance to the watch: 4 m |
250 lux |
|