Mercury Vapour Lamp Circuit Diagram

September 17, 2024 Post a Comment

Mercury vapour lamp circuit diagram

As the ionized argon conducts, the heat from its arc vaporizes the liquid mercury; next, the voltage between the two main electrodes will ionize the mercury gas. An arc initiates between the two main electrodes and the lamp will then radiate mainly in the ultraviolet, violet and blue emission lines.

Which gas is used in mercury Vapour lamp?

Construction of Mercury Vapor Lamp The inner tube has a percentage of argon gas. The lamp has two main electrodes viz. main electrode 1 & 2, which are made of tungsten wire and an auxiliary (or starting) electrode which is spaced very close to one of the main electrodes.

How many types of mercury Vapour lamps are there?

There are two types of mercury vapor light bulbs sold in the U.S. “T” type light bulbs have a self-extinguishing feature that shuts off the light within 15 minutes after the outer bulb is broken. “R” type light bulbs do not have a self-extinguishing feature.

How does a low-pressure mercury Vapour lamp work?

Fluorescent light is generated by a low-pressure mercury-vapor gas-discharge lamp in which the ultraviolet light is produced by the excited mercury vapor that causes a phosphor coated on the inside of the lamp tube to send out visible light.

How do mercury lamps 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 voltage is a mercury vapor light?

"Open circuit voltage must be high enough to start and sustain the particular lamp type. At room temperature, 250 volts DC is usually sufficient for low-voltage (135V) types, while 325 volts DC will be needed for high-voltage (265V) types." Gilway Technical Lamp Engineering Catalog. Technical Information Edition 10198.

Which metal is used in Vapour lamp?

Mercury (Hg) is the only elementary metal which has a substantial vapor pressure at room temperature. Therefore, a lamp enclosing may in principle contain mercury only. However, some starter gas such as argon or xenon is often used. Low-pressure mercury vapor lamps are often used as spectral lamps.

What is the wavelength of mercury lamp?

There is a substantial number of standard spectral lines of mercury, which can be produced with mercury-based spectral lamps; typical wavelengths are 184.5 nm, 253.7 nm, 365.4 nm, 404.7 nm, 435.8 nm, 546.1 nm, 578.2 nm and 1014 nm.

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 the working temperature of Mercury Vapour lamp?

During operation of the lamp the mercury vaporizes due to heating of the discharge tube (lamp body). The temperature of the discharge tube reaches approximately 800°C.

What is the efficiency of mercury Vapour lamp?

Lamp	Lamp efficiency (Approximate)
Sodium vapour lamp(high pressure)	67- 121 lumen/watt
Mercury vapour lamp	30 – 40 lumen/watt
Fluorescent lamp	50 – 60 lumen/watt
Incandescent lamp	8 – 40 lumen/watt

What color is a mercury lamp?

Sodium vapor and mercury vapor lamps emit yellow and bright blue light, respectively. They are very efficient, and provide high-intensity light suitable for illuminating large, open areas.

Why do mercury vapor lights turn on and off?

Sodium and mercury vapor lamps have a failure mode in which they warm up, go to normal “on” mode and after a short while overheat or over-current. They are immediately shut down by the safety circuitry in the lamp. After a few seconds, the cycle starts over.

Can a mercury lamp operate without a ballast?

As with fluorescent lights, mercury vapor lamps require a ballast to supply the proper voltage and regulate the current to the electrodes. The ballast is designed to be used with a specific size, or wattage, of bulb.

What is the power factor of mercury Vapour lamp?

Type of lamp (W)	Power demand (W) at	Current In (A)
Type of lamp (W)	Power demand (W) at	PF corrected
131	154	0.69
Mercury vapour + metal halide (also called metal-iodide)
70	80.5	0.40

Does mercury produce electricity?

A mercury vapour turbine is a form of heat engine that uses mercury as the working fluid of its thermal cycle. A mercury vapour turbine has been used in conjunction with a steam turbine for generating electricity.

What is the importance of mercury lamps?

Mercury vapor lamps have been used in lighting applications, from streets and parking lots, to landscape lighting, to factories and gymnasiums since the 1940's. They are more energy efficient than incandescent lamps and have a much longer life.

Why mercury is used in bulbs?

Mercury, an essential part of CFLs, allows a bulb to be an efficient light source. On average, CFLs contain about four milligrams of mercury sealed within the glass tubing. By comparison, older thermometers contain about 500 milligrams of mercury – an amount equal to the mercury in more than 100 CFLs.

Can I replace mercury vapor bulb with LED?

As mercury vapor lamps burn out, the most common replacement has been in the form of Light-Emitting Diode (LED) lights.

How many watts is a mercury vapor bulb?

Purchase Mercury Vapor (MV) HID bulbs at 1000Bulbs.com! Mercury Vapor bulbs offer a clear white light output and long bulb lifetimes. Available in 50W to 175W reflector shapes and 50W to 1000W HID shapes, MV lamps are a great choice for spaces needing bright, wide light coverage.