Electrical Engineering Guides

Illumination Engineering

Working Principle of a Tube Light

What is Tube Light? Tube shaped fluorescent lamp is termed as tube light. Tube light is a lamp that works on low pressure mercury vapor discharge phenomenon and converts ultra violate ray into visible ray with the help of phosphor coated inside glass tube. Material Used Inside the Tube Light The mat

By Electrical4u 03/16, 2024
Illumination Engineering

Construction of Fluorescent Lamp

A fluorescent tube light consists of a lime glass tube drop of mercury argon gas phosphor coating electrode coils mounting assemblies aluminum cap Total set up of a lamp requires two bases and electromagnetic ballast or choke coil with a starter. The electrode mount assemblies are at both the ends o

By Electrical4u 03/16, 2024
Illumination Engineering

Electronic Ballast: Working Principle & Circuit Diagram

What is Electronic Ballast? An electronic ballast (or electrical ballast) is a device that controls the starting voltage and the operating currents of lighting devices. It does this through the principle of electrical gas discharge . An electronic ballast will convert power frequency to a very high

By Electrical4u 03/16, 2024
Illumination Engineering

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 o

By Electrical4u 03/16, 2024
Illumination Engineering

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 co

By Electrical4u 03/16, 2024
Illumination Engineering

How Phosphor Coating Works in Fluorescent Lamps

Fluorescent lamps are widely used as light sources in various applications, such as homes, offices, schools, and industries. They are more energy-efficient and durable than incandescent lamps , which produce light by heating a metal filament. Fluorescent lamps produce light by exciting a gas mixture

By Electrical4u 03/16, 2024
Illumination Engineering

Radiance and Luminance

The radiant flux emitted from a point source in a certain direction per unit solid angle per unit projected area perpendicular to the specified direction is called radiance. Radiance is denoted by L e,λ and it is equal to the double derivative of radiant flux with respect to projected surface area A

By Electrical4u 03/16, 2024
Illumination Engineering

Irradiance and Illuminance

Irradiance is the radiant flux received by the detector area. The unit of irradiance is W/m 2 . Irradiance is denoted by E e,λ , φ s is the received radiant flux on the detector surface and A D is the detector area or surface. Irradiance always follows the Inverse Square Law. Suppose from a point so

By Electrical4u 03/16, 2024
Illumination Engineering

Laws of Illumination

The Inverse Square Law of Illuminance This law states that the Illuminance (E) at any point on a plane perpendicular to the line joining the point and source is inversely proportional to the square of the distance between the source and plane. Where, I is the luminous intensity in a given direction.

By Electrical4u 03/16, 2024
Illumination Engineering

Tristimulus Values and Chromaticity Coordinates

Tristimulus Values Fundamentally there are three colors. They are Red (R), Green (G) and Blue (B). Any color that stimulates human eyes is the mixture of R, G, and B in a certain proportion. Let us consider C is the color of an object as the test color. We have taken three sources of R, G, and B col

By Electrical4u 03/16, 2024
Illumination Engineering

Lamp Performance Parameters: Luminous Efficacy Correlated Colour Temperature Colour Rendering Index

Luminous Efficacy Luminous efficacy is the amount of luminous flux in lumens that a particular lamp gives per unit consumption of electric power . The unit of luminous efficacy is in lumens/watt. Luminous efficacy is the measure of the energy efficiency of a lamp – and it varies based on the type of

By Electrical4u 03/16, 2024
Illumination Engineering

Transmittance (Formula & Transmittance to Absorbance Calculation)

What is Transmittance? The transmittance of a surface or material is defined as the part of the light that moves through the other side of the surface. When light passes through any surface or material, it can be transmitted, reflected, or absorbed. Transmittance and reflectance are closely related

By Electrical4u 03/16, 2024

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Working Principle of a Tube Light

Construction of Fluorescent Lamp

Electronic Ballast: Working Principle & Circuit Diagram

Mercury Vapour Lamp

Fluorescent Lamp and Working Principle of Fluorescent Lamp

How Phosphor Coating Works in Fluorescent Lamps

Radiance and Luminance

Irradiance and Illuminance

Laws of Illumination

Tristimulus Values and Chromaticity Coordinates

Lamp Performance Parameters: Luminous Efficacy Correlated Colour Temperature Colour Rendering Index

Transmittance (Formula & Transmittance to Absorbance Calculation)

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