How does a high pressure mercury lamp work?

How does a high pressure mercury vapour lamp work?

Mercury vapour, at high pressure, is filled inside a glass tube with two electrodes. When current is passed through the tube, mercury vapour is ionized and emits a light in the ultraviolet region. In order to convert the radiation into visible radiation, the tube is coated with fluorescent material.

What happens if you get exposed to mercury?

The inhalation of mercury vapour can produce harmful effects on the nervous, digestive and immune systems, lungs and kidneys, and may be fatal. The inorganic salts of mercury are corrosive to the skin, eyes and gastrointestinal tract, and may induce kidney toxicity if ingested.

What is a main disadvantage of mercury Vapour lamps?

The main drawbacks of high-pressure mercury vapour lamps are their slow 4-7 minute warm-up time, middling energy efficiency (about 50 lumens per watt), and inferior colour rendering compared to metal halide lamps.

What is high pressure mercury Vapour lamp?

High-pressure mercury gas-discharge lamp; High-pressure mercury-vapor lamp. Definition. Lamp that produces light as a result of an electrical discharge, generated between two electrodes, in a high-pressure mercury vapor that is contained in a transparent bulb.

What happens if you inhale mercury from a light bulb?

Mercury in CFLs are present as elemental (or metallic) mercury. Once inhaled, the mercury vapor can damage the central nervous system, kidneys, and liver. These toxic effects are why any mercury spill should be handled carefully, including one that results from a CFL breaking.

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Why is mercury Vapour at low pressure?

The initial high voltage burst is necessary to produce electrons with enough kinetic eergy to ionise the mercury atoms – the atoms in the gas need to be sparse enough (low pressure) so that KE can be built up to a level that will allow ionisation of the mercury atoms.