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The candela per square metre (symbol: cd/m 2) is the unit of luminance in the International System of Units (SI). The unit is based on the candela, the SI unit of luminous intensity, and the square metre, the SI unit of area. The nit (symbol: nt) is a non-SI name also used for this unit (1 nt = 1 cd/m 2). [1]
The SI unit for luminance is candela per square metre (cd/m 2). A non-SI term for the same unit is the nit . The unit in the Centimetre–gram–second system of units (CGS) (which predated the SI system) is the stilb , which is equal to one candela per square centimetre or 10 kcd/m 2 .
I v is the luminous intensity in candelas (cd), I e is the radiant intensity in watts per steradian (W/sr), ¯ is the standard luminosity function. If more than one wavelength is present (as is usually the case), one must sum or integrate over the spectrum of wavelengths present to get the luminous intensity:
cd⋅sr [a] The lumen (symbol: lm ) is the unit of luminous flux , a measure of the perceived power of visible light emitted by a source, in the International System of Units (SI). Luminous flux differs from power ( radiant flux ), which encompasses all electromagnetic waves emitted, including non-visible ones such as thermal radiation ...
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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 ...
Here’s how to calculate how much money you’ll earn in interest when you invest in a CD account. To decide which type of CD is best for you, consider its value. Here’s how to calculate how ...
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