Gas Discharge Phenomenon in Electrical Gas Discharge Lamps

Gas discharge phenomenon is an essential characteristic of gas discharge lamps used in various lighting applications. When electric power is applied across the electrodes present inside a discharge tube, the electrodes give out electrons which bombard with the gas atoms introduced inside the discharge tube. Due to these collisions, a considerable part of the applied … Read more

Low Pressure Sodium Vapour Lamp

Low-pressure sodium vapor lamp is termed as a “miscellaneous discharge lamp” as it possesses some characteristics of High Intensity Discharge (HID) lamps as well as it resembles fluorescent lamps in other areas. Basically, LPSV lamp is a gas discharge lamp that uses sodium in an excited state to produce light. A typical LPSV lamp is … Read more

Fluorescent Lamp and Working Principle of Fluorescent Lamp

What is Fluorescent Lamp? A fluorescent lamp is a low weight mercury vapour lamp that uses fluorescence to deliver visible light. An electric current in the gas energizes mercury vapor which delivers ultraviolet radiation through discharge process and the ultraviolet radiation causes the phosphor coating of the lamp inner wall to radiate visible light. A … Read more

Electric Lamp | Types of Electric Lamp

An electric lamp is a conventional light emitting component used in different circuits, mainly for lighting and indicating purposes. The construction of lamp is quite simple, it has one filament surrounding which, a transparent glass made spherical cover is provided. The filament of the lamp is mainly made of tungsten as it has high melting … Read more

Why is Fluorescent Lamp Phosphor Coated?

Fluorescent Lamp is still the mostly used light source in our day to day life. It illuminates the very eye pleasant light. For producing eye pleasant light phosphor is used inside of the fluorescent lamp. It is used to convert ultraviolet ray radiation into visible radiation. Previously zinc beryllium silicate was used as the basic … Read more

Materials Used in Lamp Bulb

Various types of material are used to build a lamp. Insulating materials, conducting materials are the essential parts of a lamp set up. The details of those materials are given below. Glass As it is a transparent material, used as barrier. Light gets various colors depending on the color of the glass. It with stand … Read more

Mercury Vapour Lamp

In case of fluorescent lamp the mercury vapour pressure is maintained at lower level such that 60% of the total input energy gets converted into 253.7 nm single line. Again transition of the electrons requires least amount of input energy from a colliding electron. As pressure increases the chance of multiple collisions gets increased. A … Read more

Tungsten Halogen Lamps

In 1958, E.G. Fridrich and E.H. Wiley had has developed Tungsten Halogen Lamp by introducing a halogen gas (basically Iodine) inside the incandescent lamp. Basically, without halogen gas, incandescent lamp filament gradually losses its performance because of its filament evaporation at higher temperature of operation. The evaporated tungsten from the filament of normal incandescent lamp … Read more

HID Ballast Circuit and Principle

What is an HID Ballast? A HID ballast is a device that is used to control the voltage and arc current of High Intensity Discharge lamps during their operation. Classification of HID Ballast HID ballasts are classified into four categories: Reactor ballast Lag ballast Regulator ballast Auto regulator ballast A short description of each category … Read more