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  2. Candela per square metre - Wikipedia

    en.wikipedia.org/wiki/Candela_per_square_metre

    The nit (symbol: nt) is a non-SI name also used for this unit (1 nt = 1 cd/m 2). [1] The term nit is believed to come from the Latin word nitēre, "to shine". [2] As a measure of light emitted per unit area, this unit is frequently used to specify the brightness of a display device. The sRGB spec for monitors targets 80 cd/m 2. [3]

  3. Brightness - Wikipedia

    en.wikipedia.org/wiki/Brightness

    Brightness is an attribute of visual perception in which a source appears to be radiating or reflecting light. [1] In other words, brightness is the perception elicited by the luminance of a visual target.

  4. Luminance - Wikipedia

    en.wikipedia.org/wiki/Luminance

    Brightness is the term for the subjective impression of the objective luminance measurement standard (see Objectivity (science) § Objectivity in measurement for the importance of this contrast). The SI unit for luminance is candela per square metre (cd/m 2). A non-SI term for the same unit is the nit.

  5. Luminous intensity - Wikipedia

    en.wikipedia.org/wiki/Luminous_intensity

    Prior to the definition of the candela, a variety of units for luminous intensity were used in various countries. These were typically based on the brightness of the flame from a "standard candle" of defined composition, or the brightness of an incandescent filament of specific design.

  6. Foot-lambert - Wikipedia

    en.wikipedia.org/wiki/Foot-lambert

    A foot-lambert or footlambert (fL, sometimes fl or ft-L) is a unit of luminance in United States customary units and some other unit systems. A foot-lambert equals 1/π or 0.3183 candela per square foot, or 3.426 candela per square meter (the corresponding SI unit).

  7. Nit - Wikipedia

    en.wikipedia.org/wiki/Nit

    Nit, the egg case of a head louse; Nit (unit), of luminance; Nat (unit) or nit, natural unit of information; Network Investigative Technique, computer malware used by ...

  8. Insomnia: What Exactly Is It & How Do I Treat It? - AOL

    www.aol.com/insomnia-exactly-treat-125700471.html

    This article was reviewed by Daniel Z. Lieberman, MD. Overview. You’re tossing and turning, counting sheep for what seems like forever, and still, sleep won’t come.

  9. Candela - Wikipedia

    en.wikipedia.org/wiki/Candela

    The 26th General Conference on Weights and Measures (CGPM) redefined the candela in 2018. [10] [11] The new definition, which took effect on 20 May 2019, is: The candela [...] is defined by taking the fixed numerical value of the luminous efficacy of monochromatic radiation of frequency 540 × 10 12 Hz, [a] K cd, to be 683 when expressed in the unit lm W −1, which is equal to cd sr W −1 ...