Battery/Battery Life/Accuracy; Lumibrite - Seiko 4F56 Instructions Manual

Battery/Battery life/Accuracy
Battery life and its accuracy vary depending on the type of your watch.
Check the case back of your watch to identify the type of watch.
（Refer to " Daily care ".）
Type of watch
(The first four digits of the caliber
number of your watch Ex. 8F56-00D0)
4F56
8F56
○ The battery life shown above is for a watch with a new battery.
○ The battery in the watch at the time of purchase is a monitor battery inserted
in the watch at the factory for performance checks, therefore, the battery
may run down earlier than the above-specified period.
○ The accuracy is under the condition that the watch is worn on the wrist
in a normal temperature range between 5 ℃ and 35 ℃.
※Monthly rate of oss/gain may amount to approximately 4 seconds depending on the coundition of use.
○ Loss / Gain is determind per year ; i.e.,each month does not lose / gain
the same number of seconds (e.g. One month = 2 secs.,another month =
1 sec., etc)
○ Operational temperature range; −10℃〜＋60℃. (14° F〜140° F).
110
Loss/Gain
Battery Battery
SB− life （
per month
Approx.5 years
T18
±20 seconds
Approx.10 years
T19
[If your watch has lumibrite]
LumiBrite is a luminous paint that is completely harmless to human beings and natural en-
vironment, 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 5 to 8 hours. Please note, however, that, as LumiBrite emits
the light it stores, the luminance level of the light decreases gradually over time. The dura-
tion of the emitted light may also differ slightly depending on such factors as the bright-
ness of the place where the watch is exposed to light and the distance from the light
source to the watch.
<Reference data on the 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: 1m]: 1,000 lux
[Distance to the watch: 3m]: 500 lux (average room luminance) [Distance to the watch: 4m]: 250 lux

Lumibrite

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