High Pressure Mercury Lamp Construction

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.

High pressure mercury lamp construction.

High pressure mercury vapor lamps are commonly used for general lighting purposes. 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. Mercury vapor lamps are gas discharge lamps that uses an electric arc through vaporized mercury to produce light. High pressure sodium lamp hps lamp the hps lamp is the most ubiquitous lamp for street lighting on the planet.

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. In case of fluorescent lamp the mercury vapour pressure is maintained at lower level such that 60 of the total input energy gets converted into 253 7 nm single line. Figure 1 a typical high pressure mercury lamp. Mercury vapor lamps have found the greatest use in industrial applications and outdoor lighting because of their low cost and long life and lamp sizes of up to 1 000 watts.

Because mercury lamps are so prevalent in current outdoor lighting and still safe when properly installed in a serviceable fixture the need for these products will. Ushio germicidal lamps are low pressure mercury arc lamps that emit radiation peaking at 253 7nm uv c. The newer lps lamps contain less mercury than before but this has effected performance negatively. The tube contains a few milligrams of mercury and around 25 50 torr of pure argon as a buffer gas to carry the discharge while the lamp warms up producing.

At the heart of the lamp is an arc tube which is fabricated from quartz with a tungsten electrode disposed at either end. As pressure increases the chance of multiple collisions gets increased. They emit primarily in the blue and green. The lamp is an improvement over the lps lamp in that it has more acceptable color with the great efficiency of the sodium lamp.

Most models produce a bluish white light. In medium pressure mercury vapor lamps the lines from 200 600 nm are present. Again transition of the electrons requires least amount of input energy from a colliding electron. Two varieties of such lamps exist.