Sage-Tips

What is the function of glass tube in fluorescent lamp?

Fluorescent lamps work by ionizing mercury vapor in a glass tube. This causes electrons in the gas to emit photons at UV frequencies. The UV light is converted into standard visible light using a phosphor coating on the inside of the tube.

What are the parts and functions of fluorescent lamp?

General lighting There are two very distinct parts to fluorescent lighting: the tube and the fitting. Fluorescent tubes ionise mercury vapour to produce ultraviolet light, which is converted to visible light by the phosphor coating on the inside face of the tube.

What is the function of a fluorescent light ballast?

In a fluorescent lighting system, the ballast regulates the current to the lamps and provides sufficient voltage to start the lamps. Without a ballast to limit its current, a fluorescent lamp connected directly to a high voltage power source would rapidly and uncontrollably increase its current draw.

What do fluorescent tubes contain?

mercury
Fluorescent tubes contain mercury, which can be dangerous if released so be careful not to break them. The mercury is used to transport electric currents through the bulb which is the reasoning for it being there.

What are the 3 main important function of a ballast?

The functions of ballast are as follows : It provides levelled bed or support for the railway sleepers. It transfers the load from sleepers to subgrade and distributes the load uniformly on subgrade. It holds the sleepers in a firm position while the trains pass by.

Where are fluorescent lights used?

Fluorescent lamps are a lamp type that is commonly used to provide illumination for settings such as commercial lighting, industrial lighting, classroom lighting, and retail lighting. The sizes, light colors, and wattage of fluorescent tubes vary significantly.

What happens if you break a fluorescent tube?

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. A small amount of mercury vapor is released immediately. Open any windows, leave the room without stepping into the shattered bulb, and close the door.

What type of light is produced by a fluorescent tube?

Fluorescent lamp. A fluorescent lamp, or fluorescent tube, is a low-pressure mercury-vapor gas-discharge lamp that uses fluorescence to produce visible light. An electric current in the gas excites mercury vapor, which produces short-wave ultraviolet light that then causes a phosphor coating on the inside of the lamp to glow.

What is the working principle of fluorescent lamp?

1 A fluorescent lamp basically consists of a long glass gas discharge tube. 2 The tube is then finally sealed at low pressure with two filament electrodes each at its both ends. 3 These electrode filaments are used to preheat the tube and initiate a rapid conduction of electrons between the two end electrodes.

Why do fluorescent tubes need to be ionized before use?

The noble gas used in the fluorescent tube (commonly argon) must be ionized before the arc can “strike” within the tube. For small lamps, it does not take much voltage to strike the arc and starting the lamp presents no problem, but larger tubes require a substantial voltage (in the range of a thousand volts).

What is the function of a choke in a fluorescent tube?

The choke serves the purpose of stabilizing the electric flow of current in the fluorescent tube. Without a choke the current would keep increasing without any limitation until it destroys the fluorescent tube. Known also as a “ballast” it is a stabilizing device.