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These bulbs do not contain electrical filaments like those found in incandescent light bulbs, and therefore, according to some rabbinical authorities, do not constitute a fire, but rather, an electrical appliance that is permissible to move on Shabbat. [4]
A ner tamid hanging over the ark in a synagogue. In Judaism, the sanctuary lamp is known as a Ner Tamid (Hebrew, “eternal flame” or “eternal light”), Hanging or standing in front of the ark in every Jewish synagogue, it is meant to represent the menorah of the Temple in Jerusalem, as well as the perpetual fire kept on the altar of burnt offerings before the Temple. [2]
Of the 39 categories of creative activities prohibited on Shabbat, rabbinic authorities have associated at least three with incandescent lights. The overwhelming majority of Orthodox halakhic authorities maintain that turning on an incandescent light on Shabbat violates a Biblical prohibition on "igniting" a fire (Hebrew: הבערה, hav'arah), because the filament becomes glowing hot like a ...
Shabbat candles (Hebrew: נרות שבת) are candles lit on Friday evening before sunset to usher in the Jewish Sabbath. [1] Lighting Shabbat candles is a rabbinically mandated law. [2] Candle-lighting is traditionally done by the woman of the household, [3] but every Jew is obligated to either light or ensure that candles are lit on their ...
When lighting the menorah, the candles are lit each evening from left to right, starting with the shammash, the candle used to light all the others, followed by the newest candle addition (which ...
There are two types of LEDs: colored LEDs and white LEDs. Colored LEDs emit a specific color light (monochromatic light), regardless of the color of the transparent plastic lens that encases the LED's chip. The plastic may be colored for cosmetic reasons, but does not substantially affect the color of the light emitted.
Although Hunukkah is considered a minor Jewish holiday, it became more visible in the U.S. after Rabbi Menachem M. Schneerson promoted awareness and observance of the celebration through public ...
Color temperature is a parameter describing the color of a visible light source by comparing it to the color of light emitted by an idealized opaque, non-reflective body. The temperature of the ideal emitter that matches the color most closely is defined as the color temperature of the original visible light source.