does u need to charge your lume of your watch?or just from
daily wear every morning till evening indoors and it will charge itsself for the usage at night?
lume typically doesn't last that long...
http://www.nemoto.co.jp/en/products/luminova/luminova.html
i think within 6 hours will be almost completely dim in our city environment. probably in pitch black darkness you can still see something (e.g. in the cinema)