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A high-pressure sodium street light in Toronto A high-pressure sodium-vapor lamp An HPS lamp that isn't entirely off. 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.
Like other gas-discharge lamps such as the very-similar mercury-vapor lamps, metal-halide lamps produce light by ionizing a mixture of gases in an electric arc.In a metal-halide lamp, the compact arc tube contains a mixture of argon or xenon, mercury, and a variety of metal halides, such as sodium iodide and scandium iodide. [7]
The most common type of floodlight was the metal-halide lamp, which emits a bright white light (typically 75–100 lumens/Watt). Sodium-vapor lamps are also commonly used for sporting events, as they have a very high lumen to watt ratio (typically 80–140 lumens/Watt), making them a cost-effective choice when certain lux levels must be provided. [4]
Joe Salley Jr., left, and Kayla Brown worked on a lawnmower amid the debris of their mobile home wrecked by a flood in the Grapevine community of Perry County on July 28, 2022.
Cheryl McCloud, USA TODAY NETWORK - Florida June 27, 2024 at 7:04 AM From flood advisories in the Panhandle to more heat warnings, Florida is living up to its wild weather reputation today, June 27.
Flood watches that affected millions across southeastern Florida have ended but a watch remained in place for nearly 1.5 million people along eastern Florida through the evening.
Streetlamp with a ceramic metal halide bulb Ceramic metal halide bulb with G12 socket. A ceramic metal-halide lamp (CMH), also generically known as a ceramic discharge metal-halide (CDM) lamp, [1] is a type of metal-halide lamp that is 10–20% more efficient than the traditional quartz metal halide [2] and produces a superior color rendition (80-96 CRI).
Flood warnings issued in Central Florida on September 12 Officially, the strongest wind speed in Pinellas County was a gust of 87 mph (140 km/h) in Clearwater Beach , [ 24 ] while a private weather station in the same community recorded a wind gust of 96 mph (154 km/h). [ 180 ]