High Pressure Mercury Vapor Lamps Are Generally Used In

The arc discharge is generally confined to a small fused quartz arc tube mounted within a larger glass bulb.

High pressure mercury vapor lamps are generally used in.

Mercury vapor lamps are gas discharge lamps that uses an electric arc through vaporized mercury to produce light. The uv irradiation power can be as high as approximately 30 of the nominal power. Standard mercury vapor lamps are generally used to overcome problems with fluorescent lamps for outdoor use. Ultra high pressure mercury vapor lamps are used in the area of photolithography to expose various photoresists.

Are mercury lamps still legal existing mercury lamp systems should always be considered for retrofit with other high efficiency alternatives unless they operate very few hours a year and or the. The outer bulb may be clear or coated with a phosphor. The advantage is that it produces a bright white light with relatively long life. In either case the outer bulb provides thermal insulation protection from the ultraviolet radiation the.

1901 the first commercial mercury vapor lamp peter cooper hewitt new york city had a history of innovations in other fields and when he set about on the project of the mercury vapor lamp in 1898 it only took 3 years to develop the first reliable lamp with a acceptable color of light. Most models produce a bluish white light. The unique spectral emission characteristics of mercury vapor lamps are ideal for photoresists the most common of which are generally photosensitive between 350 and 500 nm wavelengths.