Seiko 2J31 - Lumibrite

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LUMIBRITE
〔IFYOURWATCHHASLUMIBRITE〕
LumiBrite is a luminous paint that is completely 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inthedark.
Forexample, if exposedtoa light of morethan500 lux forapproximately10 minutes,
LumiBritecanemitlight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appartures（40-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