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The more transparent the lighting fixture is, the higher efficacy.
Shading the light will normally decrease efficacy but increase the directionality and the visual comfort probability.
An incandescent bulb has a color temperature around 2800 to 3000 kelvins; daylight is around 6400 kelvins.
Lower color temperature lamps have relatively more energy in the yellow and red part of the visible spectrum, while high color temperatures correspond to lamps with more of a blue-white appearance.
Lighting fixtures come in a wide variety of styles for various functions.
The most important functions are as a holder for the light source, to provide directed light and to avoid visual glare.
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.
Lighting includes the use of both artificial light sources like lamps and light fixtures, as well as natural illumination by capturing daylight.
Daylighting (using windows, skylights, or light shelves) is sometimes used as the main source of light during daytime in buildings.
Some are very plain and functional, while some are pieces of art in themselves.