Posted at Sunday, October 29 2017 00:38:57 by Nichole Aragon for Lighting Fixtures
Floor or Table Lamps: If you’re looking for a more traditional light fixture, you can always opt for floor lamps or table lamps. Because of their many different shapes, sizes and designs, they are often a great way to add some flavor to your living room or bedroom. Lampshades are easy to switch, so if you’re looking for a fresh, new look for your room lights, you can change them out as often as you like.
An important property of light fixtures is the luminous efficacy or wall-plug efficiency, meaning the amount of usable light emanating from the fixture per used energy, usually measured in lumen per watt. A fixture using replaceable light sources can also have its efficiency quoted as the percentage of light passed from the "bulb" to the surroundings.
With the discovery of fire, the earliest form of artificial lighting used to illuminate an area were campfires or torches. As early as 400,000 BCE, fire was kindled in the caves of Peking Man. Prehistoric people used primitive lamps to illuminate surroundings. These lamps were made from naturally occurring materials such as rocks, shells, horns and stones, were filled with grease, and had a fiber wick. Lamps typically used animal or vegetable fats as fuel. Hundreds of these lamps (hollow worked stones) have been found in the Lascaux caves in modern-day France, dating to about 15,000 years ago. Oily animals (birds and fish) were also used as lamps after being threaded with a wick.