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Low-pressure Mercury-vapour lamps are coated with phosphors to convert the ultraviolet light emitted by the mercury into visible light that is more useful for general lighting purposes. This process allows the lamp to produce a broader spectrum of light, making it more appealing and efficient for human vision.
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What are some items that contain phosphors?
Some items that contain phosphors include fluorescent light bulbs, cathode ray tube (CRT) television screens, and computer monitors. These phosphors emit visible light when excited by ultraviolet radiation or electrons.
What is the difference between high and low pressure mercury lamps?
High pressure mercury lamps operate at higher pressures and temperatures, producing a bluish light with higher energy efficiency compared to low pressure mercury lamps. Low pressure mercury lamps operate at lower pressures and temperatures, producing a softer, more diffuse light with lower energy efficiency.
What energy conversion occurs in lamp?
A lamp converts electrical energy into light energy through the process of incandescence or by producing light through the excitation of gases or phosphors in the case of fluorescent or LED lamps.
Is there a type of crystal that produces light?
Yes, there are certain types of crystals called phosphors that can produce light when they are excited by energy sources like electricity or UV light. These crystals are commonly used in technologies such as LED lights and fluorescent lamps.
Is lamps a countable or uncountable noun?
"Lamps" is a countable noun because you can easily quantify and count the number of individual lamps.
Why are light bulbs coated with phosphorus?
They aren't. Ordinary filament lamps aren't coated with anything at all. The inside of fluorescent lamps are coated with a mixture of phosphors (NOT phosphorus but very complex metal salts). Fluorescent lamps work in two major steps. The electric current causes mercury vapour to emit ultra-violet light. The UV is absorbed by the phosphors and they re-emit it as coloured light. The mix of phosphors are there to emit a variety of colours so that the overall effect is a white light.
What are some items that contain phosphors?
Some items that contain phosphors include fluorescent light bulbs, cathode ray tube (CRT) television screens, and computer monitors. These phosphors emit visible light when excited by ultraviolet radiation or electrons.
What are the different types of light?
Incandescent Lamps Light Emitting Diode Neon Lamps Fluorescent Tubes Compact Fluorescent Lamps Halogen Lamps Metal Halide Lamps High Intensity Discharge Lamps Low Pressure Sodium Lamps High Pressure Sodium Lamps
Why do Compact Fluorescent Lamps take longer to reach full brightness?
The mercury needs time to vaporize and interact with the phosphors lining the tube.
Is there a white blue lamp in fluorescent lamps?
No, the light is produced by an electrically charged low presure mixture of mercury vapor and rare earth phosphors.
What is the difference between high pressure low pressure sodium lamps?
High pressure sodium lamps produce a brighter, more efficient light compared to low pressure sodium lamps. High pressure sodium lamps also have a longer lifespan and better color rendering properties. However, low pressure sodium lamps are more energy efficient and have a monochromatic yellow-orange light output.
What is the difference between high and low pressure mercury lamps?
High pressure mercury lamps operate at higher pressures and temperatures, producing a bluish light with higher energy efficiency compared to low pressure mercury lamps. Low pressure mercury lamps operate at lower pressures and temperatures, producing a softer, more diffuse light with lower energy efficiency.
What energy conversion occurs in lamp?
A lamp converts electrical energy into light energy through the process of incandescence or by producing light through the excitation of gases or phosphors in the case of fluorescent or LED lamps.
What are examples of phosphors?
Examples of phosphors include zinc sulfide, strontium aluminate, and europium-doped yttrium vanadate. These materials absorb energy from an external source and then emit light in a different wavelength. They are commonly used in fluorescent lamps, cathode ray tubes, and other display devices.
Can a mercury lamp be run at low pressure?
Yes, Low Pressure and Medium (High) Pressure Mercury lamps are manufactured and used for UV treatment of water etc. Medium (High) pressure UV lamps have a relatively broadband output, with many emission wavelengths between 200 and 400nm, whilst Low Pressure UV lamps have a much reduced output to the extent that they are frequently referred to as monochromatic.
Can a high pressure sodium lamp be dimmed and what are the effects?
Sodium lamps can be dimmed but we shall have to look at the effect of low voltage on lamps
Is argon gas a part of a high pressure sodium lamp?
From Wikipedia, high pressure sodium lamps use xenon, whilst low pressure ones use neon with a small amount of argon. See entry for 'sodium vapor lamps'
