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Seasonal affective disorder ( SAD) is a mood disorder subset in which people who typically have normal mental health throughout most of the year exhibit depressive symptoms at the same time each year. [1] [2] It is commonly, but not always, associated with the reductions or increases in total daily sunlight hours that occur during the summer or ...
Light therapy, also called phototherapy or bright light therapy is the exposure to direct sunlight or artificial light at controlled wavelengths in order to treat a variety of medical disorders, including seasonal affective disorder (SAD), circadian rhythm sleep-wake disorders, cancers, and skin wound infections.
A fluorescent lamp, or fluorescent tube, is a low-pressure mercury-vapor gas-discharge lamp that uses fluorescence to produce visible light. An electric current in the gas excites mercury vapor, which produces short-wave ultraviolet light that then causes a phosphor coating on the inside of the lamp to glow.
A sodium-vapor lamp is a gas-discharge lamp that uses sodium in an excited state to produce light at a characteristic wavelength near 589 nm . Two varieties of such lamps exist: low pressure and high pressure. Low-pressure sodium lamps are highly efficient electrical light sources, but their yellow light restricts applications to outdoor ...
A Tiffany lamp is a type of lamp made of glass and shade designed by Louis Comfort Tiffany or artisans, mostly women, and made (in originals) in his design studio. The glass in the lampshades is put together with the copper-foil technique instead of leaded, the classic technique for stained-glass windows. Tiffany lamps are considered part of ...
Arc lamps were superseded by filament lamps in most roles, remaining in only certain niche applications such as cinema projection, spotlights, and searchlights. In the 1950's and 1960's the high-power D.C. for the carbon-arc lamp of an outdoor drive-in projector would typically be supplied by a motor-generator combo (AC motor powering a DC ...
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