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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 ...
Photographic lighting refers to how a light source, artificial or natural, illuminates the scene or subject that is photographed; put simply, it is lighting in regards to photography. Photographers can manipulate the positioning and the quality of a light source to create visual effects , potentially changing aspects of the photograph such as ...
A Morse code light is light in which appearances of light of two clearly different durations (dots and dashes) are grouped to represent a character or characters in the Morse Code. For example, "Mo(A)" is a light in which in each period light is shown for a short period (dot) followed by a long period (dash), the Morse Code for "A".
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Capture of light emitting objects as the primary subject with light quality that is not primary but equally soft or washed as the background. [citation needed] SLR: Single-lens reflex camera. A camera where the same lens is used to view the scene and to focus its image onto a film emulsion or solid-state photosensor.
In some cases, ambient light may be used as a fill, in which case additional lighting provides the stronger light source, for example in bounce flash photography. The relative intensity of ambient light and fill light is known as the lighting ratio , an important factor in calculating contrast in the finished image.
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]
The defining equation used the symbol . The table at the end of the article used units of illuminance and the symbol , as noted above. A synonym for exposure value (EV) (e.g., Kyoritsu calibrated light sources, [1] for which the luminance ranges are specified in terms of "LV at ISO 100". Kyoritsu specify the luminance ranges of their multi ...