Low Pressure Mercury Lamp

Such a lamp can then be used for ultraviolet germicidal irradiation.

Low pressure mercury lamp.

Low pressure mercury vapor lamps usually have a quartz bulb in order to allow the transmission of short wavelength light. The low pressure uv lamps also called germicidal lamps exploit uvc light to get the rapid sterilization of bacteria molds fungi viruses and microorganisms both in air and in water in this category of lamps about 40 of electricity is converted directly into uvc radiation with monochromatic emission at 254 nm for germicidal applications and at 185 nm for the oxidation of surfaces. Nyc subways were still using original mercury arc rectifiers to convert ac to dc power up until the end of the 20th century. This article discusses the construction and working principle of low pressure mercury fluorescent lamps also known as tube lights.

Hach replacement uv for toc analyzers arc imaging chromatography photochemistry calibration of uv detectors calibrations of spectrophotometer and more. Amalgam lamps use a mercury amalgam mix to control mercury vapor pressure. 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.

The power ratings are from 4 watt to 125 watts. The low pressure mercury fluorescent lamps are commonly called as tube lights. Life time of the amalgam lamps are in excess of 12 000 hours with. Low pressure lp amalgam low pressure lp and medium pressure mp lamps are all mercury based lamps.

Amalgam lamps use less mercury than standard low pressure mercury lamps and are rohs compliant. The higher efficiency of the amalgam lamps allows less lamps per system or lower wattage lamps in the system while achieving the same results as standard low pressure mercury lamps. 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. Ushio germicidal lamps are low pressure mercury arc lamps that emit radiation peaking at 253 7nm uv c.

Rather than a cold spot the lamp s amalgam spot on pellet regulates mercury vapor pressure during operation and yields up to three times the uvc output of a standard low pressure mercury lamp of the same length. They are available in lengths from the very small of 150 mm to up to 2400mm. The average life of tube lights is about 5000 hours and also. 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. If synthetic quartz is used then the transparency of the quartz is increased further and an emission line at 185 nm is observed also. 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.