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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 ...
The Rhodes Tower was built during the 1970s energy crisis; to combat the oil shortage, the building was designed with light bulbs that would provide up to half of the building's heat, [54] [55] and without light switches in many areas, preventing office workers from interfering with the climate controls. In 1980, the Ohio Building Authority ...
The solar simulator standards have some requirements for where the illumination spectrum must be measured. For example, the IEC 60904-9 standard requires that the spectrum be measured at four different locations in a pattern given below. [17] The measurement pattern required for spectral match measurements under IEC 60904:2020
The artificial sky is a daylight simulation device that replicates the light coming from the sky dome. An architectural scale model or 1:1 full-scaled aircraft is placed under an artificial sky to predict daylight penetration within buildings or aircraft that subjects to different situations, complex geometries, or heavily obstructed windows.
Starlight overcast moonless night sky [1] 140 microlux: Venus at brightest [1] 200 microlux: Starlight clear moonless night sky excluding airglow [1] 10 −3: 1 millilux: 2 millilux: Starlight clear moonless night sky including airglow [1] 10 −2: 1 centilux: 1 centilux: Quarter Moon 10 −1: 1 decilux: 2.5 decilux: Full Moon on a clear night ...
This spectral region can contain about 10% of the total emitted light. [citation needed] Light intensity ranges from 20,000 to 500,000 cd/cm 2. An example is the "XBO lamp", which is an OSRAM trade name for a pure xenon short-arc lamp. [11] For some applications, such as endoscopy and dental technology, light guide systems are included.
The Crookes radiometer (also known as a light mill) consists of an airtight glass bulb containing a partial vacuum, with a set of vanes which are mounted on a spindle inside. The vanes rotate when exposed to light, with faster rotation for more intense light, providing a quantitative measurement of electromagnetic radiation intensity.
Blue spotlights light the exterior at night in the same color of Nationwide's logo. In December the interior lights are set so that it reads "happy holidays" to observers of the building, with thematic messages similarly displayed during other holidays and special events such as Columbus Blue Jackets and Ohio State Buckeyes victories and ...
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