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.
High pressure mercury vapour lamp construction and working.
It uses an arc through vaporized mercury in a high pressure tube to create very bright light directly from it s own arc.
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.
It consists of a discharge envelope enclosed in an outer bulb of.
As pressure increases the chance of.
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.
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.
Working of mercury vapor lamp the mercury vapor and neon gas pink in color present in the bulb requires high voltage at the starting to illuminate light.
The mercury vapor lamp is similar in construction to the sodium vapor lamp.
At the heart of the lamp is an arc tube which is fabricated from quartz with a tungsten electrode disposed at either end.
Two varieties of such lamps exist.
The mercury vapor lamp is a high intensity discharge lamp.
Basically an lpsv lamp is a gas discharge lamp that uses sodium in an excited state to produce light.
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 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.
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.
Again transition of the electrons requires least amount of input energy from a colliding electron.
The outer bulb may be clear or coated with a phosphor.
In either case the outer bulb provides thermal insulation protection from the ultraviolet radiation the.
