luminous energy measurement

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• Energy — This article is about the scalar physical quantity. For other uses, see Energy (disambiguation). Energetic redirects here. For other uses, see Energetic (disambiguation) …   Wikipedia

• measurement system — Introduction       any of the systems used in the process of associating numbers with physical quantities and phenomena (metrology). Although the concept of weights and measures (measurement) today includes such factors as temperature, luminosity …   Universalium

• List of most luminous stars — Below is a list of stars arranged in order of decreasing luminosity (increasing bolometric magnitude). Accurate measurement of stellar luminosities is quite difficult in practice, even when the apparent magnitude is measured accurately, for three …   Wikipedia

• Systems of measurement — A system of measurement is a set of units which can be used to specify anything which can be measured and were historically important, regulated and defined because of trade and internal commerce. Scientifically, when later analyzed, some… …   Wikipedia

• talbot — (T)    a unit of luminous (light) energy. One talbot is the energy carried by a light flux of one lumen in one second, that is, the talbot is the same as the lumen second (lm·s). For light of wavelength 555 nanometers (nm), the wavelength to… …   Dictionary of units of measurement

• candela — (cd)    the SI base unit for measuring the intensity of light. Candela is the Latin word for candle.    The unit has a long and complicated history. Originally, it represented the intensity of an actual candle, assumed to be burning whale tallow… …   Dictionary of units of measurement

• lumberg —    an older name for the talbot, the unit of luminous (light) energy equal to 1 lumen second …   Dictionary of units of measurement

• Light — For other uses, see Light (disambiguation). Visible light redirects here. For other uses, see Visible light (disambiguation) …   Wikipedia

• Lux — For other uses, see Lux (disambiguation). A lux meter for measuring illuminances in work places. The lux (symbol: lx) is the SI unit of illuminance and luminous emittance measuring luminous power per area. It is used in photometry as a measure of …   Wikipedia

• Exposure (photography) — Underexposure redirects here. For the 2005 film by Oday Rasheed, see Underexposure (2005 film). A long exposure showing stars rotating around the southern and northern celestial poles. Credit: European Southern Observatory …   Wikipedia

• Candela — This article is about the unit of luminous intensity. For other uses, see Candela (disambiguation). Photopic (black) and scotopic[1] (green) luminosity functions. The photopic includes the CIE 1931 standard[2] …   Wikipedia