High Pressure Mercury Vapour Lamp Construction And Working

The mercury vapor lamp is similar in construction to the sodium vapor lamp.

High pressure mercury vapour lamp construction and working.

The mercury vapor lamp is a high intensity discharge lamp. At the heart of the lamp is an arc tube which is fabricated from quartz with a tungsten electrode disposed at either end. 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. In either case the outer bulb provides thermal insulation protection from the ultraviolet radiation the.

It uses an arc through vaporized mercury in a high pressure tube to create very bright light directly from it s own arc. This is different from fluorescents which use the mercury vapor arc to create a weaker light that mainly creates uv light to excite the phosphors. When high voltage is applied we can observe that the neon gas which was originally in pink color will change into orange color by heating. Figure 1 a typical high pressure mercury lamp.

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. Two varieties of such lamps exist. The outer bulb may be clear or coated with a phosphor. As pressure increases the chance of.

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. It consists of a discharge envelope enclosed in an outer bulb of. A low pressure sodium vapor lamp or lpsv lamp is termed as a miscellaneous discharge lamp as it possesses some characteristics of high intensity discharge hid lamps as well as it resembles fluorescent lamps in other areas. 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 efficiency.

Basically an lpsv lamp is a gas discharge lamp that uses sodium in an excited state to produce light. 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.