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Topic: Color Rendering Index

Related Topics

Color temperature

Color grading

Blackbody radiation

Incandescent light bulb

Chromaticity diagram

International Commission on Illumination

Lux

Noble gas

1931

1960s

	Color temperature - Wikipedia, the free encyclopedia
		The lamp's color temperature is the temperature in kelvin at which the heated fl-body radiator matches the hue of the lamp.
		The color temperature of an incandescent light, which plots mathematically according to theory, may be referred to directly as the kelvin value of a fl-body radiator's heat when emitting the same hue.
		The CIE developed a newer model for describing and rating light sources, called the color rendering index, which is a mathematical formula describing how well a light source's illumination of eight sample patches compares to the illumination provided by a reference source.
	en.wikipedia.org /wiki/Color_temperature (1461 words)

	Lighting Design Lab Articles - Color Rendering Index
		Color rendering, expressed as a rating from 0 to 100 on the Color Rendering Index (CRI), describes how a light source makes the color of an object appear to human eyes and how well subtle variations in color shades are revealed.
		A common misconception is that color temperature and color rendering both describe the same properties of the lamp.
		Color Rendering Index is a way of measuring how well a given light source will make colors appear when viewed under the light source.
	lightingdesignlab.com /articles/cri/cri.htm (356 words)

	Color Rendering Index (CRI) High Color Output Light Bulbs
		Color rendering describes how a light source makes the color of an object appear to human eyes and how well subtle variations in color shades are revealed.
		The Color Rendering Index (CRI) is a scale from 0 to 100 percent indicating how accurate a "given" light source is at rendering color when compared to a "reference" light source.
		These spikes indicate which parts of the color spectrum will be emphasized in the rendering of color for objects illuminated by the light source.
	www.topbulb.com /find/cri.asp (768 words)

	Color Rendition (Site not responding. Last check: 2007-11-05)
		To determine the color rendering capabilities of different light sources, there are two important measurements to consider: Color Temperature and Color Rendering Index.
		Color Temperature, or Chromaticity, is a measure in degrees Kelvin that indicates the appearance of a source.
		To compare the color rendering capability of two light sources, first choose two sources with an appropriate color temperature for the situation.
	tristate.apogee.net /lite/llitcri.asp (310 words)

	Rayvern Lighting Supply's Education Page
		Color temperature is a term used to describe the color of a light source by comparing it with the color of a theoretical complete thermal radiator.
		Color rendering is a term used to describe the extent to which a light source is able to render the true color of objects.
		The Color Rendering Index is a scale that runs from 0 to 100, with incandescent assigned a CRI of 100.
	www.rayvern.com /termarc.asp (432 words)

	BuyLighting.com - Light Bulb Reference (Site not responding. Last check: 2007-11-05)
		The color temperature of a light source is a numerical measurement of its color appearance.
		Colors and light sources from the red/orange/yellow side of the spectrum are described as warm (incandescents) and those toward the blue end are referred to as cool (natural daylight).
		A specification of the color appearance of a lamp, relating its color to that of a reference source heated to a particular temperature, measured in degrees Kelvin (K); CCT generally measures the "warmth" of "coolness" of light source appearance.
	www.buylighting.com /html/reference.html (3453 words)

	Life Lite Full Spectrum Lamps Replicate Colors Accurately By Incorporating High Color Rendering Index (CRI)
		Color rendering describes how a light source makes the color of an object appear to our eyes, and how well subtle variations in color shades are revealed.
		A lamp’s color rendering ability is measured on the Color Rendering Index (CRI) scale from 0 to 100 (with 100 representing the index given to natural sunlight).
		Color rendering is sometimes confused with color temperature.
	www.lightenergysource.com /colorrendering.htm (481 words)

	Color Temperature and Color Rendering Index (Site not responding. Last check: 2007-11-05)
		Color temperature is how cool or warm the light source appears and is expressed in degrees Kelvin (K).
		Color Rendering Index (CRI) is a relative measure of the shift in surface color of an object when lit by a particular lamp, compared with how the object would appear under a reference light source of similar color temperature.
		CRI is a numerical system that rates the "color rendering" ability of a source light in comparison with natural daylight, which has a CRI of 100.
	www.hidkits.com /tab_faqs_color.htm (204 words)

	Learn About Light: Specifying Lamp Color: GE Commercial Lighting Products
		Color Rendering Index (maximum =100) is a measure of how closely the lamp renders colors of objects compared to a standard source.
		Color is complex; attempting to describe the lamp color with just one number (or even with two numbers) does not provide total information on how different materials will appear under that light.
		Such a plot with color shadings to indicate the colors corresponding to the different wavelengths is very useful in providing a visual feel for the color balance in a lamp.
	www.gelighting.com /na/business_lighting/education_resources/learn_about_light/color_specifying.htm (823 words)

	Colors and Spectral Characteristics of Fluorescent Lamps
		The color rendering index (0-100 scale) is 53 for "Warm white", 62 for "Cool white", and 79 for "Daylight".
		Color distortions of this type of fluorescent lamp are different from those of the halophosphate and deluxe halophosphate types.
		The color is slightly less green than that of a regular blue, and the spectrum has slightly less green and has a dim red-orange line near 610 nm that plain blue fluorescent lamps don't have.
	members.misty.com /don/f-spec.html (3206 words)

	Resources: Define Terms: Color Temperature and Color Rendering (Site not responding. Last check: 2007-11-05)
		Color Temperature is the color appearance of the light produced by a lamp (bulb).
		Color Temperature should not be confused with Color Rendering, which describes how a light source makes the color of objects appear.
		Light sources are rated according to a Color Rendering Index (CRI) on a scale of 0 to 100.
	www.lightsearch.com /help/colorhelp.html (239 words)

	Artograph Projectors, Light Boxes, Tracer and Spray Booths for Graphic Design
		COLOR RENDERING INDEX (CRI): A measurement of the color shift an object undergoes when illuminated by the light source, as compared to a reference source at the same color temperature.
		Color rendering is measured on an index from 0 - 100, with natural daylight and incandescent lighting both equal to 100.
		COLOR CORRECTED LENS: A compound lens, the dimensions and materials of which have been so chosen that the lens is appreciably free of aberrations.
	www.artograph.com /art_projector_glossary.htm (859 words)

	Color Rendering Index Encyclopedia Article, Definition, History, Biography (Site not responding. Last check: 2007-11-05)
		Color rendering index, or CRI, is a measure of the quality of color light, devised by the International Commission on Illumination (CIE).
		It is related to color temperature, in that the CRI measures for a pair of light sources can only be compared if they have the same color temperature.
		The perceived colors under the reference and test illumination (measured in CIE 1931 form) are compared using a standard formula, and averaged over the number of samples taken (usually eight) to get the final CRI.
	www.somelocalcolor.com /encyclopedia/Color_rendering_index (473 words)

	Color Rendering Index (Site not responding. Last check: 2007-11-05)
		Color rendering is an evaluation of how colors appear under a given light source.
		For example, a shade of red can be rendered pinker, yellower, lighter or darker dependent on the characteristics of the illumination falling on it.
		Color rendering must be considered a subjective evaluation because it depends to some degree on the coloration that is desired.
	tristate.apogee.net /lite/lfllcri.asp (191 words)

	color rendering index (Site not responding. Last check: 2007-11-05)
		Natural daylight and any light source approximating a flbody source (see color temperature) is assigned a color rendering index (CRI) of 100.
		To determine a CRI value, observers view 8 standard pastel colors under the light source being rated and under light from a flbody source (such as an incandescent lamp) having the same color temperature.
		The CRI is calculated, roughly speaking, by averaging the observers' estimation of the extent of the differences in the appearance of the colors under the two lights.
	www.sizes.com /units/CRI.htm (210 words)

	[No title]
		There are two systems of measurement commonly used to describe the color properties of a light source: “color temperature,” which expresses the color appearance of the light itself, and “color rendering index” (CRI), which suggests how an object illuminated by that light will appear in relation to its appearance under other common light sources.
		A light source’s color temperature, then, is the temperature, measured in degrees kelvin, expressed in kelvin (K), at which the color of the flbody would exactly match the color of the light source.
		Colors and light sources from the blue end of the spectrum are referred to as cool, and those toward the red/ orange/yellow side of the spectrum are described as warm.
	www.sylvania.com /LearnLighting/LightAndColor/LightColorCharacteristicf (740 words)

	Meta-Efficient: Help With Light Bulbs Terms:
		The color temperature of light refers to the temperature to which one would have to heat a "fl body" source to produce light of similar spectral characteristics.
		The Color Rendering Index, or CRI, is a term in photometry used to describe the effect of a light source on how well it renders colors.
		In essence, the Color Rendering Index (CRI) is a numerical system that rates the "color rendering" ability of fluorescent light in comparison with natural daylight.
	www.reactual.com /metaefficient/archives/2004/07/bulb_base_types.html (255 words)

	[No title] (Site not responding. Last check: 2007-11-05)
		In contrast, the color temperature Tc of lamp 4 had decreased by more than 1200 K. The influence of the operating position of the lamp on the color temperature Tc was also examined for lamps 3,4,5 and 6.
		The largest shifts of measured color points of lamps 5 and 6 during a lifetime of 1000 hours were smaller than 0.023, both in the x direction and in the y direction.
		Due to their color properties and relatively low power, the practical embodiments described have proved to be very suitable for use as light sources in SSTV (studio, stage, television), video and film recording conditions.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=01/43163.010614&ELEMENT_SET=DECL (2347 words)

	Color Temperature \| Correlated Color Temperature \| Kelvin
		Color temperature is a simplified way to characterize the spectral properties of a light source.
		While in reality the color of light is determined by how much each point on the spectral curve contributes to its output, the result can still be summarized on a linear scale.
		Technically, color temperature refers to the temperature to which one would have to heat a theoretical "fl body" source to produce light of the same visual color.
	www.schorsch.com /kbase/glossary/cct.html (432 words)

	Learn About Light: Color Rendering: GE Commercial Lighting Products
		The Color Temperature of a light source defines its "whiteness", its yellowness or blueness, its warmth or coolness.
		Colors viewed under sources with line spectra such as mercury, GE Multi-Vapor® metal halide or Lucalox® high pressure sodium lamps, may actually look better than their CRI would indicate.
		It is an indicator of the relative color rendering ability of a source and should only be used as such.
	www.gelighting.com /na/business_lighting/education_resources/learn_about_light/color_rendering.htm (497 words)

	Color Rendering Index \| General Color Rendering Index
		A method for describing the effect of a light source on the color appearance of objects, compared to a reference source of the same color temperature (CCT).
		is a measure of the average appearance of eight standardized colors chosen to be of intermediate saturation and spread throughout the range of hues.
		If a color rendering index is not qualified as to the color samples used, R
	www.schorsch.com /kbase/glossary/cri.html (135 words)

	30 New Ideas for Color Rendering
		Black-white rendering tends to be in the artistic vocabulary, while color rendering is treated as a nuisance engineering issue.
		The practical reality of color rendering is illustrated by a comparison of four lights that are equated for illuminance, and approximately equated for chromaticity, Render Ask, Fig.
		Within the color rendering model, objects are characterized by their tristimulus values under a pivotal light.
	users.starpower.net /jworthey/newideas.html (945 words)

	LST-Atlanta, Georgia, USA, Color and Light (Site not responding. Last check: 2007-11-05)
		Therefore the color temperature of a light source is defined at the value of the absolute temperature of a fl body where chromaticity matches that of a light source.
		Color rendering must be considered a subjective evaluation because it depends to some degree on the coloration which is desired.
		The variation in color rendering properties of HID sources from lamp to lamp of a given type is relatively small.
	davem.cc.emory.edu /COLOR.HTM (706 words)

	CRI
		The index in question is not called the "wavelength smoothness" index or the "fl body conformance" index; it's called the "color rendering" index so I want to know what, if anything, two sources with the same index value have in common with respect to their ability to render color.
		The color rendering index of a light source X is a measure of how close the spectrum of X matches a fl body.
		The CIE color rendering index of a light source basically compares a given light source against (essentially) a fl body radiator of the same correlated color temperature.
	www.photo.net /bboard/q-and-a-fetch-msg?msg_id=004Ieu (3325 words)

	Color
		At sunrise and sunset, the color temperature of the sun is at 2000K.
		Color Rendering Index refers to how accurately a color is perceived at a given color temperature of light.
		If an artificial light source, say an incandescent light bulb, has a color temperature of 2500K, but a CRI of 100, then that means that any colored object viewed in that orange/red light source will be viewed as accurately as it can...
	www.naturalux.com /Color.htm (894 words)

	What are the important performance characteristics of MR16 lamps? \| MR16 Lamps \| Lighting Answers \| NLPIP
		Color rendering index (CRI) - A measure of the degree of color shift that objects undergo when illuminated by a lamp, compared with those same objects when illuminated by a reference source of comparable correlated color temperature (CCT).
		As CCT increases, the appearance of the source shifts from reddish white toward bluish white; therefore, the higher the color temperature, the cooler the color appearance.
		There are seven important performance characteristics to consider: lamp life, correlated color temperature (CCT), color rendering index (CRI), lumen maintenance, beam angle and center beam candlepower, lumen output, and luminous efficacy.
	www.lrc.rpi.edu /programs/nlpip/lightingAnswers/mr16/performance.asp (2077 words)

	[No title] (Site not responding. Last check: 2007-11-05)
		Preferably, the second color of the second LED is cyan and the operating voltage of the second LED is 2.5-5 volts at a current of 20 mA.
		This device uses a complementary color to obtain high reliability and high light efficiency in comparison with the conventional device in which a blue LED and a phosphor material are used.
		The semiconductor LED device of claim 12, wherein the second color of the second LED is cyan and the operating voltage of the second LED is 2.5-5 volts at a current of 20 mA.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=05/13380.050210&ELEMENT_SET=DECL (2863 words)

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