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Topic: The Color of Light

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	Reading on Color & Light, Part I
		Colors in this purple portion of the color wheel are composed of mixtures of wavelength and cannot be represented by a single wavelength.
		The color purple shown in the color wheel (b) is composed of a mixture of light in the red and violet regions of the spectrum.
		Color is perceived in the retina by three sets of cones which are photoreceptors with sensitivity to photons whose energy broadly overlaps the blue, green and red portions of the spectrum.
	acept.asu.edu /PiN/rdg/color/color.shtml (1624 words)

	Olympus Microscopy Resource Center: Physics of Light and Color
		The simplest example of visible light reflection is the glass-like surface of a smooth pool of water, where the light is reflected in an orderly manner to produce a clear image of the scenery surrounding the pool.
		Color Temperature - The concept of color temperature is based on the relationship between the temperature and radiation emitted by a theoretical standardized material termed a fl body radiator cooled down to a state in which all molecular motion has ceased.
		Light and Color Java Tutorials - Difficult concepts in the physics of light and the science of optics are much easier to understand with the aid of interactive tutorials that demonstrate various aspects of the principles involved.
	www.olympusmicro.com /primer/lightandcolor/index.html (2216 words)

	Reflected Light (Site not responding. Last check: 2007-11-03)
		Light from the workspace is reflected in varying degrees from the front and interior surfaces of the display.
		The reflected light interferes with perception of the graphics in two main ways, depending on the shape of the reflected light and where it is within the field of view.
		When all of the colors in a laboratory visual scene were diluted by reflected light the color names given to colors that were good examples under more favorable conditions (e.g., in the center of the chromaticity region called “red”) were little affected.
	colorusage.arc.nasa.gov /refl_light.php (1320 words)

	Learn About Light: Seeing Color: GE Commercial Lighting Products
		By convention, the primary colors of light light are chosen to be red, green and blue (RGB).
		In pigments, however, a primary color is defined as one that subtracts or absorbs a primary color of light while transmitting or reflecting the other two.
		The color appearance of an object or surface clearly depends on the light used to illuminate it.
	www.gelighting.com /na/business_lighting/education_resources/learn_about_light/color_seeing.htm (635 words)

	Color Subtraction
		The color of light absorbed by a pigment is merely the complementary color of that pigment.
		The color absorbed by a primary color of paint is the complementary color of that paint.
		White light (red-green-blue) is shown incident on a sheet of paper which is painted with a pigment which absorbs one of the primary colors of light.
	www.glenbrook.k12.il.us /gbssci/phys/Class/light/u12l2e.html (2821 words)

	Herbalchemy (Site not responding. Last check: 2007-11-03)
		Further, color influencing through the environment in the form of colored lights, paints applied to a room, color of carpeting, furniture, artwork, crystals, colored clothing, and so on.
		The pineal gland is strongly related to light in that the body’s built-in light meter responds to light levels by producing melatonin, which determines circadian or metabolic rhythm.
		Color and light therapy can regenerate cells and blood, and can be as simple as applying the force of love and healing that Christ and any good physician would supply to anyone.
	herbalchemy.com /color.htm (901 words)

	Light Guide: Color Metrics
		Color temperature, expressed on the Kelvin scale (K), is the color appearance of the lamp itself and the light it produces.
		Warm light sources are generally preferred for the home, restaurants and retail applications to create a sense of warmth and comfort, while neutral and cool sources are generally preferred for offices and similar applications to create a sense of alertness.
		In addition, in retail applications, color is a critical design decision because buyers need to be able to choose products of the correct color, both to enhance the chance of its sale and to reduce the chance of it being returned once the buyer gets outside and sees it under sunlight.
	www.lightsearch.com /resources/lightguides/colormetrics.html (1169 words)

	Energy, Color and Light in Healing
		As with the use of energy, using color or light is to direct a manifestation of the essence, using your body or mind as a focus for it, as a channel.
		Color and light are also found in the human energy field—in the chakras and layers of aura—but they are more localized entities with a specific manifestation and meaning.
		You should know that, although we name and use the colors, their corresponding chakras and corresponding higher bodies, and ascribe to each a general function or involvement in the being, and treat them separately, they are not to be thought of as completely separate entities.
	www.chioshealing.com /HealingLevel3/EnergyColorLight/energycolorlight.htm (2983 words)

	The Science of Light : Light in Color
		Color is such an everyday phenomenon that we don't usually give it a lot of thought.
		Many printed color pictures are not solid color at all, but rather a sea of dots in three or four different colors.
		Colored Shadows (Requires Java.) Funny things happen when colored lights cast shadows.
	www.learner.org /teacherslab/science/light/color/index.html (171 words)

	Color Therapy Info-Original Light Studio
		The second part of colored light therapy uses "light tools." They are made out of glass, and the colors are arranged in a particular sequence and pattern.
		These light tools were nicknamed "roses" in honor of their ancestors, the huge Rose Windows of the gothic era.
		Colored light works with the aura, the electromagnetic field that surrounds every living organism.
	www.coloredlighttherapy.com /ColorTherapy.htm (1246 words)

	Light
		Visible light penetrates into the ocean, but once past the sea surface, light is rapidly weakened by scattering and absorption.
		Absorption can be caused by phytoplankton which use the light for photosynthesis, particulate matter in the water, dissolved material in the water, or the water molecule itself.
		The light energy of some colors is absorbed nearer to the sea surface than the light energy of other colors.
	www.punaridge.org /doc/factoids/Light/Default.htm (315 words)

	Colorpuncture - Light Is Life
		She also told him that the light treatments were designed to clear any underlying emotional stresses that might be related to his insomnia and bring him more in touch with his inner guidance as a part of the healing process.
		Colored light, properly applied to the body, not only supplies the necessary bioinformation to the cells, it also facilitates the exchange of information between the subconscious, conscious and superconscious mind.
		Although we experience light every day, as the language of the stars and the sun and the source of all life on this planet, until recently, there was very little inquiry into how to translate that language and use it for restoring health and overall wellbeing.
	www.colorpuncture.com /lightislife.html (1622 words)

	National Gallery of Art: Henri Matisse: Color and Light
		In the interior, colors are brushed on in large blocks or wide sweeps of color, while the outside world is painted with short wavy lines or staccato brushstrokes, not unlike the studies of neo-impressionists painters.
		His attempt to understand why some colors seemed unexpectedly dull resulted in the law of "simultaneous contrast." This suggested that colors appear most intense when juxtaposed with their complements: green next to red, for example, yellow next to violet, or orange next to blue.
		Matisse's use of the additive primaries enhances the effect of light in his painting: notice the extent to which the entire composition is based on red, blue, and green in various forms.
	www.nga.gov /education/schoolarts/matisse.htm (1356 words)

	Light and Color @ The Franklin Institute
		White light, or the light from the sun, is made of colors, and colors are different types of light recognized by their own wavelengths.
		The primary colors of light are red, blue, and green, and the secondary are yellow, cyan, and magenta.
		Each flash or ray of light, each shade of color that light makes visible, and each time our eyes receive the messages to see them, we are reminded of a special relationship—one that is often overlooked because we simply take seeing for granted.
	www.fi.edu /color (1879 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)

	The Science of Light
		Light also acts like waves—ripples in space—instead of bullets.
		Color is more than decoration, and perceiving color is tricky.
		Light behaves according to special rules; for example, it usually travels in a straight line and it bounces off mirrors at the same angle it hits them.
	www.learner.org /teacherslab/science/light (266 words)

	ScienceMaster - JumpStart - Introduction To Light and Color
		Color is a part of the electro-magnetic spectrum and has always existed, but the first explanation of color was provided by Sir Isaac Newton in 1666.
		The endless variety of color is caused by the interrelationship of three elements: Light, the source of color; the material and its response to color; and the eye, the perceiver of color.
		Colors made by combining blue, yellow, and red light are called additive; and they are formed by adding varying degrees of intensity and amounts of these three colors.
	www.sciencemaster.com /jump/physical/light_color.php (808 words)

	Light Therapy
		Light Therapy is a form of vibrational medicine that uses light on the eyes, acupuncture points, meridians, reflex zones, chakras, etc. to communicate the proper frequency for restoring health to the body and electromagnetic fie
		Each color is a specific frequency and resonates with a specific color light frequencies in the biosystem.
		Light Therapy uses light and color to nourish your inner light to reawaken your soul.
	www.luminanti.com /light.html (858 words)

	SPECIFYING LIGHT & COLOR
		Color temperature, therefore, is not really a very precise measure of color, except when specifying the chromaticity of incandescent lamps.
		Where both color and lighting level are important, use either the SP30, SP35, or SP41 General Electric Specification Series Color lamps, with 3-peak rare earth phosphors, for good color rendering and high efficiency; or the GE SPX30, SPX35, or SPX41 lamps for very good color and high efficiency.
		This suggests that, while side-by-side color comparisons are an excellent way to show the differences between light sources, since the eye never becomes adapted to either source but to a combination of both, a final color evaluation would be better made using a relatively large space, with only one color lamp lighted at a time.
	www.salsburg.com /lightcolor/lightcolor.html (2388 words)

	OSRAM SYLVANIA - Light & Color
		Color Characteristics of Light There are two systems of measurement commonly used to describe the color properties of a light source: “color temperature,” and “color rendering index” (CRI).
		Light is produced by passing an electric arc between tungsten cathodes in a tube filled with a low pressure mercury vapor and other gases.
		Lamp Color CharacteristicsFluorescent light is produced by two primary mechanisms: the mercury arc and the fluorescence of the phosphor.
	www.sylvania.com /LearnLighting/LightAndColor (430 words)

	Color Addition
		Color perception, like sound perception, is a complex subject involving the disciplines of psychology, physiology, biology, chemistry and physics.
		We have already learned that white is not a color at all, but rather the presence of all the frequencies of visible light.
		The addition of the primary colors of light was demonstrated in class using a light box.
	www.glenbrook.k12.il.us /gbssci/phys/Class/light/u12l2d.html (834 words)

	Color Matters - Design and Art - Color Theory
		In traditional color theory, these are the 3 pigment colors that can not be mixed or formed by any combination of other colors.
		Analogous colors are any three colors which are side by side on a 12 part color wheel, such as yellow-green, yellow, and yellow-orange.
		If your computer has sufficient color stability and gamma correction (link to Color Blind Computers) you will see that the small purple rectangle on the left appears to have a red-purple tinge when compared to the small purple rectangle on the right.
	www.colormatters.com /colortheory.html (663 words)

	Color Light Therapy
		Color light therapy has proven to produce profound benefits and has become very popular in today's spas.
		The effects of color light therapy have also been shown to be enhanced when used in conjunction with water and many popular hydro-tub treatments combine water and light for specific benefits.
		Hydro color light therapy during a steam treatment combines the energy of red light with the purifying effects of steam.
	www.innovativespa.com /color.htm (252 words)

	Light and color: an introduction
		Color theory is dealt with in more depth in the series on Color management.
		Portions of the visible light spectrum are absorbed by inks, which contain dyes or pigments, or by dye layers in photographic film or paper.
		It is not practical to use RGB or CMY(K) to adjust brightness or color saturation because each of the three color channels would have to be changed, and changing them by the same amount to adjust brightness would usually shift the color (hue).
	www.normankoren.com /light_color.html (1831 words)

	Winter Light: Unit 2: Visible Light & Color
		Demonstrate that white light is composed of colors.
		Color each segment in order according to the colors of the spectrum: red, orange, yellow, green, blue, indigo, violet.
		After staring at a light, the retina is so stimulated that it continues to send "after-images" even when the light is no longer entering the eye.
	www.riverdeep.net /current/2002/01/010702_light_t2.jhtml (1105 words)

	Venture Lighting, Lamp Technical Section - Color
		The "color" of light sources is derived from a complicated relationship derived from a number of different measurements, including correlated color temperature (CCT), color rendering index (CRI), and spectral distribution.
		These different combinations and the relative intensity of various wavelengths of light are used to determine the CRI of a light source.
		Designer Color® lamps that produce blue, green, aqua and pink light are available for special applications where color is needed without light loss due to filters.
	www.venturelighting.com /TechCenter/Lamp-Color.html (507 words)

	Color of Light (Site not responding. Last check: 2007-11-03)
		For example, a blue painting under a bluish light will heighten our feeling of its blueness, but a red painting under a blue light will make it very dull and grayish, because there are no "red color waves" made by the light.
		The main indicator of color is the CCT (correlated color temperature) measured in degrees Kelvin.
		Light sources also have another important index: The color rendering index (CRI) scaled 1 to 100.
	www.lightsofamerica.com /light-color.htm (166 words)

	Skytopia : Color and light trivia
		As the light rebounds inside the sphere, the intensity grows and grows - as light is rebounded for the umpteenth time - and more light is continually being pumped out from the bulb.
		I realise your light bulb might have a different brightness, or that your monitor may be darker or lighter, or even that you might be holding the piece of paper at a different distance or angle, but give it a shot - I think you might be surprised.
		I eagerly moved the paper closer to the light - and using trial and error, adjusted the angle so that it would be darker/lighter to try and match the shade on the screen.
	www.skytopia.com /project/light/light.html (4838 words)

	Color & Polarized Light Activity
		This shows the colors of light (thanks to dispersion -- the change in refractive index with wavelength) in a beam of white light.
		The dot patterns (arrays of colored circles or rectangles used by different screen manufacturers) are colored red, blue, or green.
		A portion of the reflected light is polarized.
	acept.la.asu.edu /PiN/act/color/color.shtml (1018 words)

	Color of Light
		One of the most important attributes of metal halide lamps is their ability to provide crisp white light in a variety of different color temperatures to accommodate users’ needs.
		The color of light sources is a complicated relationship deriving from a number of different factors, including Correlated Color Temperature (CCT), Color Rendering Index (CRI), and spectral distribution.
		Different colors are achieved in metal halide lamps by using different arc tube designs and by introducing various chemicals inside of the lamp arc tube.
	www.venturelighting.com /TechCenter/Lamps/color_of_light.htm (781 words)

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