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The purpose of bias lighting is to reduce the perceived brightness of the display as a result of the contrast with the slightly illuminated area around it. [1] This reduces the eye strain and fatigue that occurs when viewing a bright display against a very dark background for an extended time, [1] and increases the perceived blackness, perceived highlights, and overall contrast of the display.
An Amazon top seller, this slim, affordable LED lamp has three light temperature settings, an adjustable brightness feature, and even doubles as a phone charger. Dimensions: 4"D x 2"W x 16.65"H ...
There are two luminous efficiency functions in common use. For everyday light levels, the photopic luminosity function best approximates the response of the human eye. For low light levels, the response of the human eye changes, and the scotopic curve applies. The photopic curve is the CIE standard curve used in the CIE 1931 color space.
Photoflood lamps are a type of incandescent light bulb designed for use as a continuous light source for photographic lighting. [1] The filaments of such lamps are operated at much higher temperatures than is the case for standard, general lighting service lamps. The result is a brilliance of light much higher than the lamp's wattage rating ...
The lamp presents few limits to how one may position or orient the light. A freely adjustable lamp may include means for glare control, as a honeycomb or parabolic louvre that restricts the light output angle. A common form of home task lighting is a goose-neck lamp or swing arm light fixture.
Light valves then vary the amount of light reaching the eye, by blocking its passage in some way. Most use a fixed polarizing filter and a switching one, to block the undesired light. Many types of displays other than LCD generate their own light and do not require a backlight, for example, OLED displays, cathode-ray tube (CRT), and plasma (PDP ...