Light pollution & Sodium-vapor lamp - Unionpedia, the concept map

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Difference between Light pollution and Sodium-vapor lamp

Light pollution vs. Sodium-vapor lamp

Light pollution is the presence of any unwanted, inappropriate, or excessive artificial lighting. 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.

Flagstaff, Arizona

Flagstaff is the county seat of Coconino County, Arizona, in the southwestern United States.

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Light pollution

Light pollution is the presence of any unwanted, inappropriate, or excessive artificial lighting.

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Lumen (unit)

The lumen (symbol: lm) is the unit of luminous flux, a measure of the perceived power of visible light emitted by a source, in the International System of Units (SI).

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Luminous efficacy

Luminous efficacy is a measure of how well a light source produces visible light.

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Night vision

Night vision is the ability to see in low-light conditions, either naturally with scotopic vision or through a night-vision device.

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Observatory

An observatory is a location used for observing terrestrial, marine, or celestial events.

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Purkinje effect

The Purkinje effect or Purkinje phenomenon (sometimes called the Purkinje shift, often pronounced) is the tendency for the peak luminance sensitivity of the eye to shift toward the blue end of the color spectrum at low illumination levels as part of dark adaptation.

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San Jose, California

San Jose, officially the paren), is the largest city in Northern California by both population and area. With a 2022 population of 971,233, it is the most populous city in both the Bay Area and the San Jose–San Francisco–Oakland Combined Statistical Area—which in 2022 had a population of 7.5 million and 9.0 million respectively—the third-most populous city in California after Los Angeles and San Diego, and the 13th-most populous in the United States. Located in the center of the Santa Clara Valley on the southern shore of San Francisco Bay, San Jose covers an area of. San Jose is the county seat of Santa Clara County and the main component of the San Jose–Sunnyvale–Santa Clara Metropolitan Statistical Area, with an estimated population of around two million residents in 2018. San Jose is notable for its innovation, cultural diversity, affluence, and sunny and mild Mediterranean climate. Its connection to the booming high tech industry phenomenon known as Silicon Valley prompted Mayor Tom McEnery to adopt the city motto of "Capital of Silicon Valley" in 1988 to promote the city. Major global tech companies including Cisco Systems, eBay, Adobe Inc., PayPal, Broadcom, and Zoom maintain their headquarters in San Jose. San Jose is one of the wealthiest major cities in the world, with the third-highest GDP per capita (after Zürich and Oslo) and the fifth-most expensive housing market. It is home to one of the world's largest overseas Vietnamese populations, a Hispanic community that makes up over 40% of the city's residents, and historic ethnic enclaves such as Japantown and Little Portugal. Before the arrival of the Spanish, the area around San Jose was long inhabited by the Tamien nation of the Ohlone peoples of California. San Jose was founded on November 29, 1777, as the Pueblo de San José de Guadalupe, the first city founded in the Californias. It became a part of Mexico in 1821 after the Mexican War of Independence. Following the American Conquest of California during the Mexican–American War, the territory was ceded to the United States in 1848. After California achieved statehood two years later, San Jose was designated as the state's first capital. Following World War II, San Jose experienced an economic boom, with a rapid population growth and aggressive annexation of nearby cities and communities carried out in the 1950s and 1960s. The rapid growth of the high-technology and electronics industries further accelerated the transition from an agricultural center to an urbanized metropolitan area. Results of the 1990 U.S. census indicated that San Jose had officially surpassed San Francisco as the most populous city in Northern California. By the 1990s, San Jose had become the global center for the high tech and internet industries and was California's fastest-growing economy for 2015–2016. Between April 2020 and July 2022, San Jose lost 42,000 people, 4.1% of its population, dropping to 12th largest city position in largest city ranking.

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Sea turtle

Sea turtles (superfamily Chelonioidea), sometimes called marine turtles, are reptiles of the order Testudines and of the suborder Cryptodira.

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Security lighting

In the field of physical security, security lighting is lighting that intended to deter or detect intrusions or other criminal activity occurring on a property or site.

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Sodium-vapor lamp

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.

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Spectral line

A spectral line is a weaker or stronger region in an otherwise uniform and continuous spectrum.

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Street light

A street light, light pole, lamp pole, lamppost, street lamp, light standard, or lamp standard is a raised source of light on the edge of a road or path.

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Watt

The watt (symbol: W) is the unit of power or radiant flux in the International System of Units (SI), equal to 1 joule per second or 1 kg⋅m2⋅s−3.

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