2 edition of Retroreflectance MAP service for coefficient of luminous intensity found in the catalog.
Retroreflectance MAP service for coefficient of luminous intensity
Kenneth L. Eckerle
by U.S. Dept. of Commerce, National Bureau of Standards in Washington, D.C
|Other titles||Retroreflectance M.A.P. service for coefficient of luminous intensity.|
|Statement||Kenneth L. Eckerie and Jack J. Hsia.|
|Series||NBS special publication ;, 671|
|Contributions||Hsia, J. J., United States. National Bureau of Standards.|
|LC Classifications||QC100 .U57 no. 671, QC425 .U57 no. 671|
|The Physical Object|
|Pagination||vi, 49 p. :|
|Number of Pages||49|
|LC Control Number||84601001|
Luminous intensity - a photometric quantity describing the perceivable, visible brightness of light. The SI unit for luminous intensity is the Candela (cd). In order to render an opinion to the users, luminous intensity distribution curves of interior lighting luminaires are given at least for the planes of C0 o o and C90oo. For road lighting luminaires, the curves should be given in minimum for C0oo C90oo and Imax planes in which the maximum luminous intensity is obtained.
Cartesian Luminous Intensity Graph: The diagram indicates the distribution of luminous intensity, in candelas of the luminaire. The curve shown provides a visual guide to the type of distribution expected from the luminaire e.g. narrow or wide beam etc, in addition to intensity . This diagram is useful when light intensity changes rapidly within a small angular area . calculation of the luminous intensity of street lighting calculo de la iluminancia para el alumbrado publico. although the quality of a street lighting installation can only be evaluated from the luminance values obtained on the road surface and the degree of glare, it is often necessary to know illumination values on the road surface.
The intensity of the luminous flux forced from a light source in a given direction; measured in candelas (cd) What is Illuminance (E) Density of luminous flux received by a What is the coefficient of utilization? (CU) The ratio of lamp lumens which ultimately reach the work plane to the. Luminous efficacy (of radiation) K: lumen per watt: lm/W: M −1 L −2 T 3 J: Ratio of luminous flux to radiant flux: Luminous efficacy (of a source) η: lumen per watt: lm/W: M −1 L −2 T 3 J: Ratio of luminous flux to power consumption Luminous efficiency, luminous coefficient V: 1: Luminous efficacy normalized by the maximum possible.
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Additional Physical Format: Online version: Eckerle, Kenneth L. Retroreflectance MAP service for coefficient of luminous intensity. Washington, D.C.: U.S. Dept. Retroreflectance MAP Service for Coefficient of Luminous Intensity [K L et al Eckerle] on *FREE* shipping on qualifying : K L et al Eckerle.
Get this from a library. Retroreflectance MAP service for coefficient of luminous intensity. [Kenneth L Eckerle; J J Hsia; United States. National Bureau of Standards.]. en The coefficient of luminous intensity R of the retro-reflective area, when measured after a recovery period of 48 hours as specified in Annex 7, paragraph 1, at an entrance angle of 5° and an observation angle of 20′, shall be not less than the value in Annex 7, table 1.
Luminous efficacy is a measure of how well a light source produces visible light. It is the ratio of luminous flux to power, measured in lumens per watt in the International System of Units (SI).
Depending on context, the power can be either the radiant flux of the source's output, or it can be the total power (electric power, chemical energy, or others) consumed by the source. coefficient of luminous intensity (of a retroreflector) [R]quotient of the luminous intensity, I, of the retroreflector in the direction of observation by the illuminance, at the retroreflector on a plane perpendicular to the direction of the incident light Unit: cd⋅lx In photometry, luminous intensity is a measure of the wavelength-weighted power emitted by a light source in a particular direction per unit solid angle, based on the luminosity function, a standardized model of the sensitivity of the human SI unit of luminous intensity is Other units: candlepower, Hefnerkerze.
NIST in the past has provided a MAP service document in NBS Special Publicationâ Retroreflectance MAP Service for Coefficient of Luminous Intensity.â (2) The original MAP package contained several types of retroreflectors that are chosen as diagnostic tools for certain aspects of a retroreflectometer, shown in Figure Unfortunately, this book can't be printed from the OpenBook.
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Below is the uncorrected machine-read text. The NBS/NIST Special Publication series, first published as the NBS Miscellaneous Publication series, is comprised of material that, because of its character or size, does not fit into any of the other regular publication series.
The Miscellaneous Publications series was published from SearchWorks Catalog Stanford Libraries. Retroreflectance MAP service for coefficient of luminous intensity  Eckerle, Kenneth L. Washington, D.C.: U.S. Dept. of Commerce, National Bureau of Standards: For sale by the Supt.
of Docs., U.S. G.P.O., Va.: For sale by the National Technical Information Service], Luminous intensity definition: a measure of the amount of light that a point source radiates in a given direction. It | Meaning, pronunciation, translations and examples. In photometry, luminous intensity is a meisur o the wavelenth-wichtit pouer emittit bi a licht soorce in a pairteecular direction per unit solit angle, based on the luminosity function, a staundartised model o the sensitivity o the human ee.
Start studying A.R.E Building Systems - Lighting. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Luminous intensity, the quantity of visible light that is emitted in unit time per unit solid angle.
The unit for the quantity of light flowing from a source in any one second (the luminous power, or luminous flux) is called the lumen.
The lumen is evaluated with reference to visual sensation. The. • The luminous intensity (measured in candelas) is the amount of light emitted into a certain direction, measured in 1 m distance. • If the point light source emits Ø lumens into a small spatial angle ß, the luminous intensity is I=Ø/ß.
The unit of luminous intensity is candela. There is a standard that details the candela definition. Candela is defined as the luminous intensity of a specific source which emits luminous flux equal to one lumen in a solid angle per stereoradian (sr).
Ι= Φ ω r = 1m. 1cd 1cd φ = 1 Lm E = 1 Lux S = 1 m2 ω ω (total) = 4π stereoradians r = 1 α = 1 radian α (total) = 2 π radians δ = 1 Chapter 5. LUMINOUS MEASUREMENTS. Lighting Fundamentals Handbook, Electric Power Research Institute, TR, March This handbook provides basic information on lighting principles, lighting equipment, and other considerations related to lighting design.
It is not intended to be an up-to-date reference on. Iu is the luminous intensity in that direction. Alternatively, the luminance of a surface can be calculated from the formula L = E x § / ¹ where § is the luminance factor of the surface material and is read from a table of values.
If the surface is diffuse then § can be replaced with "p", the diffuse reflection coefficient for the material.
Luminous intensity. In photometry, luminous intensity is a measure of the wavelength-weighted power emitted by a light source in a particular direction per unit solid angle, based on the luminosity function, a standardized model of the sensitivity of the human eye.
The SI unit of luminous intensity is the candela (cd), an SI base unit. * In photometry, luminous intensity is a measure of the wavelength-weighted power emitted by a light source in a particular direction per unit solid angle, based on the luminosity function, a standardized model of the sensitivity of the human eye.Due to this reason the luminous intensity of a surface is given as:If E is the intensity of illumination and r is the reflecting power of the surface then the luminous intensity is`B = r E`Si Unit for Luminous IntensityThe SI unit of the luminous intensity is candelas per meter square i.e.
Candela/ the above formula, if any surface has r.A relative method is proposed for measuring the coefficient of retro reflective light intensity CRLI through specific coefficient of retro reflective Luminance CRL and area of controlled product. In contrast to the adopted absolute measurement method, by measuring the ratio of light intensity of retro reflective sample to illuminance on it, it is proposed to measure reflectance of retro Author: Eduard V.