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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

    Pages in category "Light sources" The following 61 pages are in this category, out of 61 total. This list may not reflect recent changes. ...

  4. Light - Wikipedia

    en.wikipedia.org/wiki/Light

    The study of light, known as optics, is an important research area in modern physics. The main source of natural light on Earth is the Sun. Historically, another important source of light for humans has been fire, from ancient campfires to modern kerosene lamps.

  5. List of reflected light sources - Wikipedia

    en.wikipedia.org/.../List_of_reflected_light_sources

    The Moon Zodiacal light Reflection nebula. This is a list of reflected sources of light examples in contrast to the List of light sources. The list is oriented ...

  6. Umbra, penumbra and antumbra - Wikipedia

    en.wikipedia.org/wiki/Umbra,_penumbra_and_antumbra

    An alternative definition is that the penumbra is the region where some or all of the light source is obscured (i.e., the umbra is a subset of the penumbra). For example, NASA 's Navigation and Ancillary Information Facility defines that a body in the umbra is also within the penumbra.

  7. Synchrotron light source - Wikipedia

    en.wikipedia.org/wiki/Synchrotron_light_source

    A synchrotron light source is a source of electromagnetic radiation (EM) usually produced by a storage ring, [1] for scientific and technical purposes. First observed in synchrotrons , synchrotron light is now produced by storage rings and other specialized particle accelerators , typically accelerating electrons .

  8. Luminous flux - Wikipedia

    en.wikipedia.org/wiki/Luminous_flux

    Luminous flux is often used as an objective measure of the useful light emitted by a light source, and is typically reported on the packaging for light bulbs, although it is not always prominent. Consumers commonly compare the luminous flux of different light bulbs since it provides an estimate of the apparent amount of light the bulb will ...

  9. 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]