Lumibrite; Power Source; Water Resistant Performance - Seiko 7B72 How To Use Manual

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>
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Condition
Sunlight
Indoor (Window-side during
daytime)
Distance to the watch: 1 m
Lighting apparatus (40-watt daylight
Distance to the watch: 3 m
fluorescent light)
Distance to the watch: 4 m
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* Overcharge prevention function
When the secondary battery is fully charged, the overcharge prevention function is automatically
activated to avoid further charging.
There is no need to worry about damage caused by overcharging no matter how much the
secondary battery is charged in excess of the "time required for fully charging the watch."
* For the required time to fully charge the battery, see "Guide to charging times" → P.35.
■ Notes on charging the watch
• When charging the watch, do not place the watch in close proximity to an intense light
source such as lighting equipment for photography, spotlights or incandescent lights,
as the watch may be excessively heated resulting in damage to its internal parts.
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• When charging the watch by exposure to direct sunlight, avoid places that easily reach
high temperatures, such as a car dashboard.
• Always keep the watch temperature under 60°C.
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Lumibrite

Illumination
Fine weather 100,000 lux
Cloudy weather 10,000 lux
Fine weather More than 3,000 lux
Cloudy weather 1,000 to 3,000 lux
Rainy weather Less than 1,000 lux
1,000 lux
500 lux (Average room luminance)
250 lux
b WARNING

Power Source

The battery used in this watch is a special secondary battery, which is different from ordinary
batteries.
Unlike an ordinary silver oxide battery, the secondary battery does not require periodic
replacement.
The capacity or charging efficiency may gradually lower due to long-term use or operating
environment.
In addition, long-term use may shorten the charge duration due to wear, contamination, lubricant
deterioration of mechanical parts, etc. Request repair when the performance lowers.
b WARNING
■ Notes on replacing the secondary battery
• Do not remove the secondary battery from the watch.
Replacement of the secondary battery requires professional knowledge and skill.
Please ask the retailer from whom the watch was purchased for replacement of the
secondary battery.
• Installation of an ordinary silver oxide battery can generate heat that can cause
bursting and ignition.

Water resistant performance

Refer the table below for the description of water resistant performance of your watch before using.
(Please look at P.39.)
Indication on the Water resistant
case back performance
No indication Non-water resistance Avoid drops of water or sweat
The watch withstands
WATER Water resistance for
accidental contact with
RESISTANT everyday life
water in everyday life.
WATER Water resistance for
RESISTANT everyday life at 5-BAR The watch is suitable for sports such as swimming.
5 BAR water resistant
WATER Water resistance for
RESISTANT everyday life at 10 (20)-BAR The watch is suitable for diving not using an air cylinder.
10（20）BAR water resistant
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Conditions of Use
b WARNING
Please do not use it for
swimming.
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