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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 ...
In this 10-second exposure, facing south toward Sagittarius, three forms of light pollution are present: skyglow, glare, and light trespass.. Light used for all purposes in the outdoor and indoor environments contributes to the artificial skyglow.
Artificial sunlight is useful in treating and preventing seasonal affective disorder (also known as winter depression, which causes depression symptoms specifically in winter), [3] and delayed sleep phase syndrome, in which the circadian rhythm (the rhythmic alternation between daylight and nighttime behavior and bodily states) is disturbed and the person falls asleep much later than he or she ...
Poorly designed lighting can also compromise safety. For example, glare creates safety issues around buildings by causing very sharp shadows, temporarily blinding passersby making them vulnerable to would-be assailants. [62] [63] The negative ecological effects of artificial light have been increasingly well documented.
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.
The transmitted light varies over the day; should this not be desired, light tubes can be combined with artificial light in a hybrid set-up. [27] [44] [45] [46] Some artificial light sources are marketed which have a spectrum similar to that of sunlight, at least in the human visible spectrum range, [47] [48] [49] as well as low flicker. [49]
Synthetic peptides and proteins are one example of the biological materials that are utilized in artificial light harvesting systems, virus templated assemblies [22] and DNA origami [9] [10] have also been employed for light harvesting applications.
LED lighting, digital screens, and fluorescent bulbs are examples of common artificial blue light sources. [7] [6] LED lighting is widely used due to its durability and energy efficiency. [2] It emits more blue light than traditional incandescent bulbs, potentially impacting the quality of sleep and eye health if used excessively at night. [2] [8]
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