A Shabbat lamp is a special lamp that has movable parts to expose or block out its light so it can be turned "on" or "off" while its power physically remains on. This enables the lamp to be used by Shabbat observant Jews to make a room dark or light during Shabbat without actually switching the electrical power on or off, an act that is prohibited during Shabbat.
The Shabbat lamp is manufactured in China by Kosher Innovations, a Toronto-based company. It was invented by Shmuel Veffer in 2004, and since then, tens of thousands have been sold to observant Jews.
Read more about Shabbat Lamp: Halakha of The Shabbat Lamp, See Also
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“Life is the lust of a lamp for the light that is dark till the dawn
of the day when we die.”
—A.C. (Algernon Charles)