Gas-discharge lamps are a family of artificial light sources that generate light by sending an electric discharge through an ionized gas, a plasma. … The color of the light produced depends on the emission spectra of the atoms making up the gas, as well as the pressure of the gas, current density, and other variables.
How does electric discharge fluorescent lamp operate?
A fluorescent lamp consists of a glass tube filled with a mixture of argon and mercury vapour. Metal electrodes at each end are coated with an alkaline earth oxide that gives off electrons easily. When current flows through the gas between the electrodes, the gas is ionized and emits ultraviolet radiation.
How does light from electric discharge work?
Several types of lamps produce light by establishing a permanent electric arc in a gas. This process is known as electric discharge, or gaseous discharge. … It receives light from the arc inside the lamp and changes the light to the desired color as it glows through the glass.
Is light from electric discharge efficient?
Modern electrical light sources
They are inexpensive, reliable, and readily available, but they are inefficient in their use of energy. Luminescent lamps, which produce less heat than incandescent lamps, include electric discharge lamps, semiconductor lamps, and chemical lamps.
What are the drawbacks of discharge lamps?
Some of the disadvantages of compact fluorescent bulbs are that they are cold temperature sensitive, not recommended for enclosed fixtures, can have a higher initial cost than incandescent, have a longer warm up time, they may have limited color temperatures, do not dim nearly as smoothly, and dimming decreases the …
Why do we use a discharge tube instead of a light bulb?
the helium is used instead of a light bulb because a certain element only emits certain wavelengths of light while the bulb would emit all wavelengths, and even if you were to split this with a prism you would still see all the colors and not specific ones.
What is meant by discharge lamp?
: an electric lamp in which an enclosed gas or vapor glows or causes a phosphor coating on the lamp’s inner surface to glow.
How does a discharge tube work?
A gas- discharge tube is usually a glass tube with two electrodes sealed through its walls. When a voltage is applied to the two electrodes and the pressure of the gas in the tube is reduced, eventually a pressure is reached at which a current flows, and the gas begins to glow.
Which is the most energy efficient lamp?
LED bulbs. Generally, the most energy efficient lighting technology you can buy for your home is the Light Emitting Diode (LED). A quality LED produces the most light with the least electricity.