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root((LUM))
lumen
In physics, the standard unit for measuring the rate of the flow of light.
🌱The lumen is a measure of the perceived power of light. 🌳There are two common units for measuring light, the candela and the lumen. Both are recognized as standard international units, which also include the second （for time）, the kilogram （for weight）, and the meter （for length）. The candela is a measure of intensity; an ordinary candle gives off light with the intensity of about one candela. The lumen is a measure of "luminous flux"; a standard 100-watt lightbulb gives off 1500–1700 lumens. Luminous flux indicates how much light is actually perceived by the human eye. Technologies vary in how efficiently they turn electricity into light; halogen lights produce about 12 lumens per watt, ordinary incandescent lightbulbs produce about 15 lumens per watt, and compact fluorescent bulbs produce about 50 lumens per watt. luminous 1、 Producing or seeming to produce light.
2、 Filled with light.
🌱She ended her recital with a luminous performance of Ravel's song cycle, and the crowd called her back for repeated encores. 🌳Luminous, like its synonyms radiant, shining, glowing, and lustrous, is generally a positive adjective, especially when it describes something that doesn't literally glow, such as a face, a performance, or a poem. Luminous signs depend on a gas such as neon, krypton, argon, xenon, or radon—and you can use luminous （DayGlo） paint to make your own signs. New technologies have now given us luminous fabrics, which are being used to produce striking or creepy effects in clothing, upholstery, and interior surfaces. bioluminescent Relating to light given off by living organisms.
🌱Most of the light emitted by bioluminescent marine organisms is blue or blue-green. 🌳Bio- comes from the Greek word for "life" （See BIO.）On land, fireflies, glowworms, and the fox-fire fungus are all known for their bioluminescence. In the sea, bioluminescent life-forms include plankton, squid, and comb jellies, as well as some unusual fish. Most deep-sea animals are bioluminescent, but single-celled algae living at or near the surface can also create a remarkable show, as they often do in Bioluminescent Bay on the Puerto Rican island of Vieques. But bioluminescence is unknown in true plants, and mammals, birds, reptiles, and amphibians never got the knack of it either. luminary A very famous or distinguished person.
🌱Entering the glittering reception room, she immediately spotted several luminaries of the art world. 🌳The Latin word luminaria could mean either "lamps" or "heavenly bodies." For medieval astrologers, the luminaries were the sun and the moon, the brightest objects in the heavens. Today a luminary is usually a person of "brilliant" achievement: a celebrity, a "leading light," or a "star."
🌱The lumen is a measure of the perceived power of light. 🌳There are two common units for measuring light, the candela and the lumen. Both are recognized as standard international units, which also include the second （for time）, the kilogram （for weight）, and the meter （for length）. The candela is a measure of intensity; an ordinary candle gives off light with the intensity of about one candela. The lumen is a measure of "luminous flux"; a standard 100-watt lightbulb gives off 1500–1700 lumens. Luminous flux indicates how much light is actually perceived by the human eye. Technologies vary in how efficiently they turn electricity into light; halogen lights produce about 12 lumens per watt, ordinary incandescent lightbulbs produce about 15 lumens per watt, and compact fluorescent bulbs produce about 50 lumens per watt. luminous 1、 Producing or seeming to produce light.
2、 Filled with light.
🌱She ended her recital with a luminous performance of Ravel's song cycle, and the crowd called her back for repeated encores. 🌳Luminous, like its synonyms radiant, shining, glowing, and lustrous, is generally a positive adjective, especially when it describes something that doesn't literally glow, such as a face, a performance, or a poem. Luminous signs depend on a gas such as neon, krypton, argon, xenon, or radon—and you can use luminous （DayGlo） paint to make your own signs. New technologies have now given us luminous fabrics, which are being used to produce striking or creepy effects in clothing, upholstery, and interior surfaces. bioluminescent Relating to light given off by living organisms.
🌱Most of the light emitted by bioluminescent marine organisms is blue or blue-green. 🌳Bio- comes from the Greek word for "life" （See BIO.）On land, fireflies, glowworms, and the fox-fire fungus are all known for their bioluminescence. In the sea, bioluminescent life-forms include plankton, squid, and comb jellies, as well as some unusual fish. Most deep-sea animals are bioluminescent, but single-celled algae living at or near the surface can also create a remarkable show, as they often do in Bioluminescent Bay on the Puerto Rican island of Vieques. But bioluminescence is unknown in true plants, and mammals, birds, reptiles, and amphibians never got the knack of it either. luminary A very famous or distinguished person.
🌱Entering the glittering reception room, she immediately spotted several luminaries of the art world. 🌳The Latin word luminaria could mean either "lamps" or "heavenly bodies." For medieval astrologers, the luminaries were the sun and the moon, the brightest objects in the heavens. Today a luminary is usually a person of "brilliant" achievement: a celebrity, a "leading light," or a "star."
LUM comes from the Latin noun lumen, meaning "light." Thus, our word illuminate means "to supply with light" or "make clear," and illumination is light that shines on something.🌸