Low Pressure Mercury Lamp Uses

Low pressure sodium lamps were invented first in 1920 by arthur h.

Low pressure mercury lamp uses.

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. Right around 1900 the mercury arc rectifier was developed this luminous device was very important for power conversion. In low pressure mercury vapor lamps only the lines at 184 nm and 254 nm are present. Lps development and inventors.

Determine required and desired light levels energy efficiency requirements intensity and clarity of light length of life and costs. 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. Two varieties of such lamps exist. Ushio germicidal lamps are low pressure mercury arc lamps that emit radiation peaking at 253 7nm uv c.

Amalgam lamps use a mercury amalgam mix to control mercury vapor pressure. In medium pressure mercury vapor lamps the lines from 200 600 nm are present. 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. The larger lps lamps used in street lighting for the most part do not use argon.

Low pressure mercury lamps are very similar to a fluorescent lamp with a wavelength of 253 7 nm 1182 5 thz. Low pressure mercury lamps have been manufactured in jelight company inc. Argon has a lower glow voltage argon helps the smaller lamps start at a lower voltage. These early low pressure lamps used a lot of mercury today s lamps use a tiny amount of mercury.

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. Since 1978 for a variety of applications such as. The first lamp was a round bulb with two electrodes. Hach replacement uv for toc analyzers arc imaging chromatography photochemistry calibration of uv detectors calibrations of spectrophotometer and more.

Nyc subways were still using original mercury arc rectifiers to convert ac to dc power up until the end of the 20th century. Fused silica is used in the manufacturing to keep the 184 nm light from being absorbed. 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. 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.