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light measurement

См. также в других словарях:

  • light watt —    a unit measuring the relative power output of a light source. Calculating the power delivered in the form of visible light is rather complicated. For a monochromatic (single frequency) light source such as a laser, the power in light watts… …   Dictionary of units of measurement

  • light year — (ly)    a unit of distance used in astronomy. One light year is the distance that light travels in one year through a vacuum (and, of course, most of the Universe is close to being a vacuum). In the official definition of the International… …   Dictionary of units of measurement

  • light second —    a unit of distance equal to the distance light travels in a vacuum in one second. In accordance with the official definition of the meter, this distance is exactly 299 792 458 meters (about 186 282.4 miles). Similarly, a light minute is 60… …   Dictionary of units of measurement

  • Light meter — A light meter is a device used to measure the amount of light. In photography, a light meter is often used to determine the proper exposure for a photograph. Typically a light meter will include a computer, either digital or analogue, which… …   Wikipedia

  • Light pollution — This article is about light pollution in the visible spectrum. For information on pollution in the radio spectrum, see radio spectrum pollution. This time exposure photo of New York City at night shows skyglow, one form of light pollution …   Wikipedia

  • Measurement and Signature Intelligence — Measurement and Signature Intelligence, or MASINT, refers to intelligence gathering activities that bring together disparate elements that do not fit within the definitions of the major disciplines mentioned above. As a means of collecting… …   Wikipedia

  • Measurement and signature intelligence — (MASINT) is a branch of intelligence gathering activities. MASINT, may have aspects of intelligence analysis management, since certain aspects of MASINT, such as the analysis of electromagnetic radiation received by signals intelligence are more… …   Wikipedia

  • Light Reflectance Value — Light Reflectance Value, or LRV, is a measurement commonly used in interior decorating and design, which expresses the percentage of light that is reflected from a surface.LRV is frequently included on the backs of paint chips or samples and is… …   Wikipedia

  • light — light1 lightful, adj. lightfully, adv. /luyt/, n., adj., lighter, lightest, v., lighted or lit, lighting. n. 1. something that makes things visible or affords illumination: All colors depend on light. 2. Physics …   Universalium

  • Measurement — For bust/waist/hip measurement, see BWH. A typical tape measure with both metric and US units and two US pennies for comparison Measurement is the process or the result of determining the ratio of a physical quantity, such as a length, time,… …   Wikipedia

  • Light-year — For other uses, see Light year (disambiguation). Image showing the scale of a light year (outer shell) and a light month (inner shell) surrounding the Sun compared to Comet 1910 A1 s orbit (yellow line) and Comet Hyakutake s orbit (orange line).… …   Wikipedia

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