Seiko 7B24 Manual - Page 49

To Preserve the Quality of Your Watch ■ Lumibrite If your watch has Lumibrite Lumibrite is a luminous paint that is completely harmless to human beings and natural environment, containing no noxious materials such as radioactive substance. Lumibrite is a newly-developed luminous paint that absorbs the light energy of the sunlight and lighting apparatus 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. Condition Sunlight Fine weather Cloudy weather Indoor (Window- Fine weather side during Cloudy weather daytime) Rainy weather Lighting apparatus (40-watt daylight fluorescent light) Distance to the watch: 1 m Distance to the watch: 3 m Distance to the watch: 4 m Illumination 100,000 lux 10,000 lux more than 3,000 lux 1,000 to 3,000 lux less than 1,000 lux 1,000 lux 500 lux (average room luminance) 250 lux 129