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  2. List of light sources - Wikipedia

    en.wikipedia.org/wiki/List_of_light_sources

    This is a list of sources of light, the visible part of the electromagnetic spectrum.Light sources produce photons from another energy source, such as heat, chemical reactions, or conversion of mass or a different frequency of electromagnetic energy, and include light bulbs and stars like the Sun. Reflectors (such as the moon, cat's eyes, and mirrors) do not actually produce the light that ...

  3. Standard illuminant - Wikipedia

    en.wikipedia.org/wiki/Standard_illuminant

    There are no actual daylight light sources, only simulators. Constructing a practical light source that emulates a D-series illuminant is a difficult problem. The chromaticity can be replicated simply by taking a well known light source and applying filters, such as the Spectralight III, that used filtered incandescent lamps. [22]

  4. Light - Wikipedia

    en.wikipedia.org/wiki/Light

    Another example is incandescent light bulbs, which emit only around 10% of their energy as visible light and the remainder as infrared. A common thermal light source in history is the glowing solid particles in flames, but these also emit most of their radiation in the infrared and only a fraction in the visible spectrum.

  5. Light pollution - Wikipedia

    en.wikipedia.org/wiki/Light_pollution

    Specific categories of light pollution include light trespass, over-illumination, glare, light clutter, and skyglow. A single offending light source often falls into more than one of these categories. [9] [10] Solutions to light pollution are often easy steps like adjusting light fixtures or using more appropriate light bulbs.

  6. Sources of electrical energy - Wikipedia

    en.wikipedia.org/wiki/Sources_of_electrical_energy

    Light: Energy produced by light being absorbed by photoelectric cells, or solar power. Chemical: Energy produced by chemical reaction in a voltaic cell, such as an electric battery. Pressure: Energy produced by compressing or decompressing specific crystals. Magnetism: Energy produced in a conductor that cuts or is cut by magnetic lines of ...

  7. Radiant energy - Wikipedia

    en.wikipedia.org/wiki/Radiant_energy

    In the past, the term "electro-radiant energy" has also been used. [4] The term "radiant energy" also applies to gravitational radiation. [5] [6] For example, the first gravitational waves ever observed were produced by a black hole collision that emitted about 5.3 × 10 47 joules of gravitational-wave energy. [7]

  8. Absorption (electromagnetic radiation) - Wikipedia

    en.wikipedia.org/wiki/Absorption_(electromagnetic...

    A white light source—emitting light of multiple wavelengths—is focused on a sample (the pairs of complementary colors are indicated by the yellow dotted lines). Upon striking the sample, photons that match the energy gap of the molecules present (green light in this example) are absorbed, exciting the molecules. Other photons are scattered ...

  9. Category:Light sources - Wikipedia

    en.wikipedia.org/wiki/Category:Light_sources

    Download QR code; Print/export Download as PDF; Printable version; In other projects Wikimedia Commons; Wiktionary; Wikidata item; ... Pages in category "Light sources"

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