Low Pressure Mercury Lamp Uses

Mercury vapor lamps have been used in lighting applications from streets and parking lots to landscape lighting to factories and gymnasiums since the 1940 s.

Low pressure mercury lamp uses.

Low pressure mercury lamps are very similar to a fluorescent lamp with a wavelength of 253 7 nm 1182 5 thz. Low pressure sodium lamps were invented first in 1920 by arthur h. Hach replacement uv for toc analyzers arc imaging chromatography photochemistry calibration of uv detectors calibrations of spectrophotometer and more. Argon has a lower glow voltage argon helps the smaller lamps start at a lower voltage.

Lps development and inventors. In low pressure mercury vapor lamps only the lines at 184 nm and 254 nm are present. Designed by experienced engineers and by using quality material in combination with a tightly controlled manufacturing process we provide high quality lamps free of impurities to maintain strong and stable output throughout life of the lamp. Low pressure mercury lamps have been manufactured in jelight company inc.

The lamps can be constructed to emit primarily in the uv a around 400 nm or uv c around. Since 1978 for a variety of applications such as. Ushio germicidal lamps are low pressure mercury arc lamps that emit radiation peaking at 253 7nm uv c. Right around 1900 the mercury arc rectifier was developed this luminous device was very important for power conversion.

In medium pressure mercury vapor lamps the lines from 200 600 nm are present. The most common form of germicidal lamp looks similar to an ordinary fluorescent lamp but the tube contains no fluorescent phosphor in addition rather than being made of ordinary borosilicate glass the tube is made of fused quartz or vycor 7913 glass. Nyc subways were still using original mercury arc rectifiers to convert ac to dc power up until the end of the 20th century. These early low pressure lamps used a lot of mercury today s lamps use a tiny amount of mercury.

Two varieties of such lamps exist. Low pressure sodium lamps the most efficient gas discharge lamp type producing up to 200 lumens per watt but at the expense of very poor color. Amalgam lamps use a mercury amalgam mix to control mercury vapor pressure. Fused silica is used in the manufacturing to keep the 184 nm light from being absorbed.

The larger lps lamps used in street lighting for the most part do not use argon. Neon lighting a widely used form of cold cathode specialty lighting consisting of long tubes filled with various gases at low pressure excited by high voltages used as advertising in neon signs. Low pressure and high pressure low pressure sodium lamps are highly efficient electrical light sources but their yellow light restricts applications to outdoor lighting such as street lamps where they are widely used. 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.