Lumibrite - Seiko ASTRON User Manual

7
TO PRESERVE THE QUALITY OF YOUR WATCH
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.
 In general, when you enter a dark place from a bright environment, your eye cannot adapt to the change in light levels quickly. At first, you can hardly see anything,
but as time passes, your vision gradually improves. (Dark adaptation of the human eye)

Lumibrite

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Reference data on the luminance
Condition
Fine weather
Sunlight
Cloudy weather
Fine weather
Indoor (Window-side
Cloudy weather
during daytime)
Rainy weather
1 m
Lighting apparatus
(Distance from 40-watt
3 m
daylight fluorescent
light)
4 m
ASTRON 7X52 GPS SOLAR
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
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