Here, they must survive a zombie apocalypse with nothing but their wit and the supplies they can find lounging around. The candela per square metre is sometimes called the nit.DayZ is a hardcore survival MMORPG that places players in a post-apocalyptic world. Luminous flux per unit solid angle per unit projected source area. The lumen second is sometimes called the talbot. Brightness, the subjective impression of luminance.Radiance, radiometric quantity analogous to luminance.Luma, the representation of luminance in a video monitor.Exposure value § EV as a measure of luminance and illuminance.The image can never be "brighter" than the source. The light at the image plane, however, fills a larger solid angle so the luminance comes out to be the same assuming there is no loss at the lens. As an example, if one uses a lens to form an image that is smaller than the source object, the luminous power is concentrated into a smaller area, meaning that the illuminance is higher at the image. This means that for an ideal optical system, the luminance at the output is the same as the input luminance.įor real, passive optical systems, the output luminance is at most equal to the input. Luminance is invariant in geometric optics. The sun has a luminance of about 1.6 ×10 9 cd/m 2 at noon. A typical computer display emits between 50 and 300 cd/m 2. Luminance is used in the video industry to characterize the brightness of displays. In this case, the solid angle of interest is the solid angle subtended by the eye's pupil. Luminance is thus an indicator of how bright the surface will appear. Luminance levels indicate how much luminous power could be detected by the human eye looking at a particular surface from a particular angle of view. Luminance is often used to characterize emission or reflection from flat, diffuse surfaces. 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. A non-SI term for the same unit is the nit. The SI unit for luminance is candela per square metre (cd/m 2), as defined by the International System of Units (SI is from the French Système international d'unités) standard for the modern metric system. It describes the amount of light that passes through, is emitted from, or is reflected from a particular area, and falls within a given solid angle.īrightness 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). Luminance is a photometric measure of the luminous intensity per unit area of light travelling in a given direction. A tea light-type candle, imaged with a luminance camera false colors indicate luminance levels per the bar on the right (cd/m 2)
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