What is a Luminous Intensity Distribution Diagram?

An illustration of the many directions in which light is emitted from a light source is called a luminous intensity distribution diagram. It displays how the brightness or intensity varies as the light leaves the source at various angles. In order to comprehend how a light source will illuminate its surrounds and to make sure that lighting needs are satisfied for a certain space or application, this kind of diagram is frequently used in lighting design and analysis.
To show and study the different directions in which light is emitted from a light source, a luminous intensity distribution diagram is utilized. It offers a graphic depiction of the luminous intensity’s spatial distribution, making it possible to predict how light will be distributed in a specific space. This knowledge is useful for lighting design because it makes it easier to choose the right light fixtures and arrange them in a way that produces the right amounts of uniformity and lighting in a room. The figure also aids in assessing the efficacy and efficiency of lighting systems.

A luminous intensity distribution diagram should take into account the following primary parameters:
Beam Angle: The light source’s angular spread is indicated by this parameter. Determining the width or narrowness of the light beam is crucial for attaining the intended coverage and intensity in a particular area.
Peak Intensity: Usually shown on the graphic, this is the greatest luminous intensity that the light source can produce. Determining the light’s peak intensity facilitates determining its brightness and focus.
Uniformity: Maintaining uniform lighting levels throughout a space requires uniformity in the distribution of light. The graphic aids in assessing the uniformity of illumination by demonstrating how evenly the light is dispersed throughout the beam angle.
Field Angle: This parameter indicates the angle at which the brightness decreases to a particular percentage, say 50%, of its maximum intensity. It offers important details regarding the light beam’s coverage and reach.
Lighting designers and engineers can make well-informed judgments regarding the selection and placement of light fixtures to match the intended lighting requirements for a specific space by examining these characteristics on the luminous intensity distribution diagram.
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