Are you aloud to open your window shade on shabbos? the kosher lamp does exectly the same. as to the spirit of the halacha, there is actuly a halacha to not sit in the dark on shabbos.
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Are you aloud to open your window shade on shabbos? the kosher lamp does exectly the same. as to the spirit of the halacha, there is actuly a halacha to not sit in the dark on shabbos.