lighting. Friday , July 28th , 2017 - 20:38:57 PM
Today, the lighting of a special lamp or candles on the eve of the Sabbath is regarded as a religious duty. The early Tannaim (the first generation of rabbis of the Mishnaic and Talmudic period) regarded it as a well-known practice so much so that their discussions often dealt with the minor details connected with it, sch as the kind of wick or oil to be allowed as opposed to its origin. While the Hebrew Bible does not explicity direct the lighting of Sabbath lights, it does prohibit the kindling of lights on the Sabbath. The inference therefore is to provide light before the onset of the Sabbath.
Table lamps are also useful for lighting a low ceiling room. Unlike recessed, sconce, or torchiere-generated light, table lamps provide focused task lighting for areas such as desks, kitchen counters, and work benches. Their easy accessibility permits them to be turned on and off at will, or to be replaced or moved as a room's dcor is updated.
Local building control authorities determine the amount of time that a ceiling can hold back the fire, thus the term fire-rated ceilings. Typical fire rating for a ceiling is an hour and the best ones can last up to two hours. Cutting a hole in a ceiling to fit downlights will compromise the ceilings fire rating. Because downlights are not designed to fit seamlessly into a ceiling, the gaps formed within the light fitting will now be the ceilings weakest point where flames and smoke can pour through and spread the fire to the floor above. Ideally, each luminaire in a downlight fitting should be fitted with a fire protection cover which prevents both flames and heat being transmitted through the luminair up into a ceiling gap.
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