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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. Category:Light sources - Wikipedia

    en.wikipedia.org/wiki/Category:Light_sources

    Bahasa Indonesia; עברית ... Download QR code; Print/export Download as PDF; Printable version; In other projects ... Pages in category "Light sources"

  4. List of lighthouses in Indonesia - Wikipedia

    en.wikipedia.org/wiki/List_of_lighthouses_in...

    White-painted cast iron tower with lantern and gallery. Located on Sembilangan Island off the extreme western tip of Madura. The lighthouse is both a landfall light and the rear light of a range guiding ships into the channel between Madura and Java to approach the port of Surabaya. [7] Tanjung Layar / Ujung Kulon, First Point / Eerste Punt ...

  5. 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.

  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. Natural resource - Wikipedia

    en.wikipedia.org/wiki/Natural_resource

    Natural resources can be a substantial part of a country's wealth; [7] however, a sudden inflow of money caused by a resource extraction boom can create social problems including inflation harming other industries ("Dutch disease") and corruption, leading to inequality and underdevelopment, this is known as the "resource curse".

  8. Phosphor - Wikipedia

    en.wikipedia.org/wiki/Phosphor

    A phosphor is a substance that exhibits the phenomenon of luminescence; it emits light when exposed to some type of radiant energy. The term is used both for fluorescent or phosphorescent substances which glow on exposure to ultraviolet or visible light, and cathodoluminescent substances which glow when struck by an electron beam ( cathode rays ...

  9. Lighting - Wikipedia

    en.wikipedia.org/wiki/Lighting

    To define light source color properties, the lighting industry predominantly relies on two metrics, correlated color temperature (CCT), commonly used as an indication of the apparent "warmth" or "coolness" of the light emitted by a source, and color rendering index (CRI), an indication of the light source's ability to make objects appear natural.

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