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Before diving, therefore, be sure to expose the watch to light under the conditions specified
above, so that it fully absorbs and stores light energy. Otherwise, use the watch together with an
underwater flashlight.
< Reference data on luminance >
(A) Sunlight
[Fine weather]: 100,000 lux [Cloudy weather]: 10,000 lux
(B) 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
(C) 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
* “LUMIBRITE” is a trademark of SEIKO CORPORATION.