Best answer: How does a low pressure mercury lamp work?

Definition: A lamp that consists of vaporized mercury to generate light by using an electric arc is known as a mercury vapor lamp. Basically, this lamp discharges gas when heated or cooled. The mercury which is present inside the tube is in liquid form (at room temperature) which is ionized before generating light.

How does a low pressure mercury Vapour lamp work?

A mercury-vapor lamp is a gas-discharge lamp that uses an electric arc through vaporized mercury to produce light. … They operate at an internal pressure of around one atmosphere and require special fixtures, as well as an electrical ballast.

How does a mercury lamp produce light?

They produce light when electric current passes between two electrodes (also called cathodes) in a tube filled with low-pressure mercury vapor and inert gases, such as argon and krypton. The electric current excites the mercury vapor in the tube, generating radiant energy, primarily in the ultraviolet (UV) range.

What is a low pressure mercury lamp?

High-efficiency low-pressure mercury lamps offer 30% to 60% higher output at a spectral output of 254 nm and are ozone-free. … Standard low-pressure mercury lamps made of synthetic or natural quartz glass have spectral output at 254 nm and 185 nm and are ozone-generating.

IT IS INTERESTING:  How does light from a flashlight travel?

Where is a low pressure mercury lamp used?

Low-pressure mercury lamps are also used as relatively efficient sources of ultraviolet light for applications like UV curing, lithography, UV spectroscopy, solarium, ozone generation, water sterilization and other germicidal irradiation. A particularly high radiance is not required for such applications.

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 the working temperature of mercury vapour lamp?

Product & Operation Description

During operation of the lamp the mercury vaporizes due to heating of the discharge tube (lamp body) and the gas between the electrodes approaches temperatures of up to 10000oC. The temperature of the discharge tube reaches approximately 800oC.

How does 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 is a main disadvantage of mercury vapour lamps?

They are more energy efficient than incandescent lamps and have a much longer life. The disadvantage is they do not flatter the human skin color thereby making them not an ideal technology for indoor applications. They are exceptional sources, though, for landscape lighting applications.

IT IS INTERESTING:  What is the best headlight bulb upgrade?

Are mercury vapor lights being phased out?

According to the act, mercury vapor security lights are being phased out to “protect the environment” and to “promote energy efficiency” in lighting. … According to the ban, existing fixtures can remain in service but, as they burn out, they must be replaced with newer, more efficient lighting alternatives.

How much power does a mercury vapor light use?

Compared with newer HID lighting, mercury vapor isn’t very energy efficient. The “efficacy”—or amount of light produced per unit of electricity consumed—is 20-60 lumens per watt. This is better than incandescent lamps (about 15-20 lumens per watt), but significantly lower than other HID lighting.

What are mercury lamps explain with figure?

A schematic diagram of mercury lamp is shown below. This lamp is containing an inner quartz arc tube and outer borosilicate glass envelope. The quartz tube is able to withstand arc temperature 1300K, whereas the outer tube withstands only 700K. Between two tubes nitrogen gas is filled to provide thermal insulation.

Is mercury lamp a monochromatic source?

These monochromatic lights have been in use for over a century as a monochromatic light source. Sodium lamps, mercury lamps, and spark lamps are all common examples.