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.
What is low pressure mercury Vapour lamp?
Low Pressure Mercury Vapour Lamp (Fluorescent Tube): A fluorescent lamp is a low weight mercury vapour lamp that uses fluorescence to deliver visible light.
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.
What is the difference between sodium Vapour lamp and mercury Vapour lamp?
Answer: The light in Sodium Vapour lamp is from an atomic emission process whereas in Mercury Vapour Lamp it is, finally, from fluorescence emission. The mechanism of light emission in a sodium vapour lamp is simple and straight-forward.
Where are low pressure mercury lamps 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.
Where is a low pressure mercury lamp used?
Do UV light bulbs contain mercury?
Although UV disinfection is generally considered safer than chemical disinfection, all conventional UV lamps typically use between 5-200 mg of mercury per lamp. UV LEDs are mercury-free and provide a safer alternative.
Why is mercury in fluorescent light bulbs?
Mercury is an essential element in the operation of fluorescent lighting; it allows the bulbs to be an efficient light source. Because CFLs contain trace amounts of mercury, it is important to educate yourself on proper use, recycling and disposal of these products.
Can you get mercury poisoning from light bulbs?
Compact fluorescent light bulbs (CFLs) contain small amounts of mercury. A small percentage of this mercury can be released into the air if the bulbs are broken. Mercury can cause poisoning in some circumstances. Even so, people are encouraged to replace their “old fashioned” incandescent bulbs with CFLs.
Do high pressure sodium bulbs contain mercury?
HPS lamps generally contain 10 to 50 mg of mercury. A small percentage contains more than 50 mg of mercury. Mercury vapor lighting is the oldest HID technology.
What is a low pressure mercury vapor lamp?
Low pressure mercury vapor lamps are a highly efficient source of UV light, particularly short wavelength UV light (254nm and 185nm). Often called germicidal or ozone absorption lamps, they are very stable light sources.
What are the characteristics of mercury vapor grid lamps?
Jelight Company Inc. has extensive experience in the manufacturing of mercury vapor grid lamps. All grid lamps have high intensity, low noise, and are uniform across the grid.
How does a color corrected 80 watt mercury vapor lamp work?
Warm-up of a color corrected 80 W high-pressure mercury vapor lamp to half brightness. When a mercury vapor lamp is first turned on, it will produce a dark blue glow because only a small amount of the mercury is ionized and the gas pressure in the arc tube is very low, so much of the light is produced in the ultraviolet mercury bands.
What does a clear mercury lamp look like?
Clear mercury lamps produce white light with a bluish-green tint due to the chemicals used within the arc tube, which is mostly mercury. Because of this, mercury lamps are not suited to render human skin color well, so such lamps are typically not used in retail stores, schools, hospitals and other similar commercial applications.
