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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 ...
This is a list of reflected sources of light examples in contrast to the List of light sources. The list is oriented towards visible light reflection.
Single-photon source; Skyglow; Solar transition region; Sonoluminescence; Star; Starlight; Lists of stars; List of brightest natural objects in the sky; List of brightest stars; Stellar corona; STEVE; Sun; Sunlight; Supernova; List of supernova remnants; Swedish torch; Synchrotron light source
There are two significant differences between natural lighting and artificial sources: the character of the fill and the fall-off in intensity. In nature, light from the sky is omni-directional and usually brighter from above. That "wrap around" characteristic is difficult to duplicate with a directional artificial source.
Artificial light at night refers to any light source other than a natural light source. Sources of artificial light include LEDS and fluorescents. This particular light source has effect on the reproduction, immune function, metabolism, thermoregulation and body temperature of organisms that need light for their daily activity.
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.
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 . With the development of electric lights and power systems , electric lighting has effectively replaced firelight.
The reflector had found favor where the choices of artificial light provided poor illumination compared to modern electric lighting. Light shelves are an effective way to enhance the lighting from windows on the equator-facing side of a structure, this effect being obtained by placing a white or reflective metal light shelf outside the window. [19]