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's light to be controlled by those
Shabbat observant Jews who accept this use,
to make a room dark or light during Shabbat without actually switching the
electrical power
Electric power is the rate of transfer of electrical energy within a electric circuit, circuit. Its SI unit is the watt, the general unit of power (physics), power, defined as one joule per second. Standard prefixes apply to watts as with oth ...
on or off, an act prohibited by Orthodox Judaism on both Shabbat and the Jewish Holidays.
Shabbat lamps for children, such as the teddy bear pictured here, have features for covering the light without tampering with electricity. Under the bear's hat is a black shell that turns to completely hide the lightbulb.
Halakha
There are various
Jewish laws governing Shabbat lamps that enable their use by those
[ who permit controlling them during Shabbat.
The lamp itself cannot be moved from its location due to the laws of muktzah. However, most authorities agree the component that is used to open or close the light is not attached, and under Jewish law, has the status of a lamp shade, which can be moved during Shabbat in order to control the amount of light that is exposed.
In addition, it is problematic in halacha to move a light because, historically, the most common lights were candles or other flames which could easily go out if moved. (This applies only to Shabbat; during a Yom Tov that does not coincide with Shabbat, the lamp may be moved but not unplugged, as moving a candle on such a day is permitted.) The restriction on moving candles may also apply to incandescent lights, which are generally treated in halacha as similar to fires. However, Shabbat lamps are lit by and only accept a ]compact fluorescent lamp
A compact fluorescent lamp (CFL), also called compact fluorescent light, energy-saving light and compact fluorescent tube, is a fluorescent lamp designed to replace an incandescent light bulb; some types fit into light fixtures designed for incan ...
. These bulbs do not contain electrical filament
An incandescent light bulb, also known as an incandescent lamp or incandescent light globe, is an electric light that produces illumination by Joule heating a filament until it glows. The filament is enclosed in a glass bulb that is eith ...
s like those found in incandescent light bulb
An incandescent light bulb, also known as an incandescent lamp or incandescent light globe, is an electric light that produces illumination by Joule heating a #Filament, filament until it incandescence, glows. The filament is enclosed in a ...
s, and therefore, according to some rabbinical authorities, do not constitute a fire, but rather, an electrical appliance that is permissible to move on Shabbat.[Shemirath Shabbat Kehilchathah 13:40]
Practically speaking, a normal lamp could be covered
See also
* Electricity on Shabbat
* Shabbat clock
* Sabbath mode
References
External links
Shabbat lamp U.S. patent info
{{Shabbat
Shabbat innovations
Types of lamp