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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 ...
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 light was warmed with an orange gel to match the sunset. Photographic lighting refers to how a light source, artificial or natural, illuminates the scene or subject that is photographed. Photographers can manipulate the positioning and the quality of a light source to create visual effects, potentially changing aspects of the photograph ...
Images of auroras from across the world, including those with rarer red and blue lights Aurora australis seen from the ISS , 2017 [ 1 ] An aurora [ a ] ( pl. aurorae or auroras ), [ b ] also commonly known as the northern lights ( aurora borealis ) or southern lights ( aurora australis ), [ c ] is a natural light display in Earth 's sky ...
Sunlight is a key factor in photosynthesis, the process used by plants and other autotrophic organisms to convert light energy, normally from the Sun, into chemical energy that can be used to synthesize carbohydrates and fuel the organisms' activities. Daylighting is the natural lighting of interior spaces by admitting sunlight.
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.
Available light. Photography of the sound reinforcement system prior to a pop concert, wherein the room was mainly dark except the blue spotlight. Though the exposure time of 1⁄4 second at 180 mm focal length (equivalent to 35 mm film) would typically result in a relatively strong blur, the image is quite sharp which is the result of the ...
The night sky is the nighttime appearance of celestial objects like stars, planets, and the Moon, which are visible in a clear sky between sunset and sunrise, when the Sun is below the horizon. Natural light sources in a night sky include moonlight, starlight, and airglow, depending on location and timing. Aurorae light up the skies above the ...