Electrical Engineering Guides

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
Illumination Engineering

Reflectance, Reflectivity, and the Solar Reflectance Index

What is Reflectance Reflectance is defined as the ratio of the radiant flux reflected from the surface or body of a material (ф r ) to the incident radiant flux (ф i ). Reflectance is denoted by ρ (or p ). The reflectance is a ratio of radiant flux . Therefore, it is unitless. The reflectance varies

By Electrical4u 03/16, 2024
Illumination Engineering

Radiometry: What is it?

What is Radiometry? Radiometry is a technique to measure electromagnetic radiation for any wavelength. Photometry is similar to radiometry, but photometry is related to visible light signals only, while radiometry includes signals of any wavelength – like ultraviolet, infrared, and visible light. Ra

By Electrical4u 03/16, 2024
Illumination Engineering

Fresnel Equations: What are they? (Derivation & Explanation)

What are the Fresnel Equations? The Fresnel Equations (also known as the Fresnel coefficients) are defined as the ratio of the electric field of a reflected and transmitted wave to the electric field of the incident wave. This ratio is complex and hence, it describes relative amplitude as well as ph

By Electrical4u 03/15, 2024
Illumination Engineering

Stroboscopic Motion: What is it?

What is Stroboscopic Motion? Stroboscopic motion (also known as the Stroboscopic Effect) is defined as a visual phenomenon that occurs when continuous rotational motion is represented by a series of short samples (as opposed to a continuous view) at a sampling rate close to the period of the motion.

By Electrical4u 03/15, 2024
Illumination Engineering

Radiant Flux: A Comprehensive Guide

Radiant flux is a term that describes the amount of radiant energy that is emitted, reflected, transmitted, or received by an object per unit of time. Radiant energy is the energy carried by electromagnetic waves, such as light, radio waves, microwaves, infrared, ultraviolet, and X-rays. Radiant flu

By Electrical4u 03/15, 2024
Illumination Engineering

Black Body Radiation: Definition, Characteristics, and Applications

A black body is defined as an idealized object that absorbs all electromagnetic radiation that falls on it and emits radiation with a continuous spectrum that depends only on its temperature. Black body radiation is the thermal radiation emitted by a black body in thermodynamic equilibrium with its

By Electrical4u 03/15, 2024

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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)

Reflectance, Reflectivity, and the Solar Reflectance Index

Radiometry: What is it?

Fresnel Equations: What are they? (Derivation & Explanation)

Stroboscopic Motion: What is it?

Radiant Flux: A Comprehensive Guide

Black Body Radiation: Definition, Characteristics, and Applications

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