what are the differences between red light and blue light?
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Red light has a slightly longer wavelength than blue light. Red light (at one end of the visible spectrum) has a longer wavelength than blue light. However, another way of distinguishing between the different colors of light is by their frequency, that is, the number of waves that pass by a point every second.
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Additive (Light) Color Primaries Red, green, and blue are the primary colors of light—they can be combined in different proportions to make all other colors. For example, red light and green light added together are seen as yellow light.
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Sunlight is the most significant source of blue light. Artificial sources of blue light include fluorescent light, compact fluorescent light (CFL) bulbs, LEDs, flat screen LED televisions, computer monitors, smart phones and tablet screens.
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While police vehicles have red and blue lights, ambulances and fire engines only have red lights. This lighting is called emergency vehicle lighting. It can also be used to make other drivers aware of a hazard when stationary. ... Blue lights are only used by vehicles that have the authority to pull you over.
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Therefore, the difference between light and color is that light is energy made up of wavelengths, whereas colors are the various wavelengths our eyes are sensitive to and can see once the light is reflected from or emitted from matter.
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Red light is visible and is most effective for use on the surface of the skin. Red light occupies the “long end” of the visible spectrum with wavelengths of 630nm-700nm. Infrared light is invisible and is effective for use on the surface of the skin as well as penetration of about 1.5 inches into the body.
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Visible light ranges from low blue to far-red light and is described as the wavelengths between 380 nm and 750 nm, although this varies between individuals. The region between 400 nm and 700 nm is what plants use to drive photosynthesis and is typically referred to as Photosynthetically Active Radiation (PAR).
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LED lights are more efficient than fluorescent lights, but they also produce a fair amount of light in the blue spectrum. Richard Hansler, a light researcher at John Carroll University in Cleveland, notes that ordinary incandescent lights also produce some blue light, although less than most fluorescent lightbulbs.
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There are some differences between sunlight and artificial light – most artificial light doesn't emit as much energy in the red and blue region of the light spectrum as sunlight does. The sun, a torch, and a light bulb all emit energy in the form of particles called photons. ... But sunlight is best for most plants.
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The major difference between laser light and light generated by white light sources (such as a light bulb) is that laser light is monochromatic, directional and coherent. Monochromatic means that all of the light produced by the laser is of a single wavelength.
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Blue light is a range of the visible light spectrum, defined as having a wavelength between 400−525 nm. This includes wavelengths between violet and cyan in the spectrum.
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One is to use individual LEDs that emit three primary colors—red, green and blue—and then mix all the colors to form white light. The other is to use a phosphor material to convert monochromatic light from a blue or UV LED to broad-spectrum white light, similar to a fluorescent lamp.
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The light emitted from a laser is monochromatic, that is, it is of one wavelength (color). In contrast, ordinary white light is a combination of many different wavelengths (colors).
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In short, the angle of diffraction is directly proportional to the size of the wavelength. Hence red light (long wavelength) diffracts more than blue light (short wavelength). And radio waves (really long wavelength) diffract more than X-rays (really short wavelengths).
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Red, green, and blue are the primary colors of light—they can be combined in different proportions to make all other colors.
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Red, green, and blue are the primary colors of light—they can be combined in different proportions to make all other colors. For example, red light and green light added together are seen as yellow light.
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Red light has a lower frequency (longer wavelength), while violet light has a higher frequency (shorter wavelength). ... That's why we have not only refraction (bending of light), but also dispersion, like in a prism. Red light entering glass is broken less than violet light.