Working Principle Of High Pressure Mercury Vapour Lamp

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Working principle of high pressure mercury vapour lamp. The high pressure helps increase efficiency and this was developed in 1936 35 years after the low pressure lamps came out. 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. Working principle of mercury vapor lamp author. In either case the outer bulb provides thermal insulation protection from the ultraviolet radiation the.

Two varieties of such lamps exist. 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. After that the lamp would heat fast and mercury became a vapor. The outer bulb may be clear or coated with a phosphor.

The light would intensify as the arc grew stronger in the tube. Electrical articles 8 may 18 the extensive use of the mercury vapor lamp depends entirely upon the versatility of the mercury vapor as regards pressure temperature voltage and other characteristics each change resulting in a lamp of different spectral quality and. A mercury vapor lamp is a gas discharge lamp that uses an electric arc through vaporized mercury to produce light the arc discharge is generally confined to a small fused quartz arc tube mounted within a larger borosilicate glass bulb.