Led goniophotometer: what it is and how it's used

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An instrument called a goniophotometer measures the amount of light reflected off an item at various angles. With the advent of LED-light sources, where the spatial distribution of light is not uniform, goniophotometers have become more popular in recent years.

A Lambertian source is one whose illumination is uniform over its surface. Severe requirements make it crucial that the spatial dispersion of light be considered when designing vehicle lighting.

Both the kind of light source and the goniophotometer have a role in determining the number of distribution curves for luminous intensity and the measurement planes it may select.

Three different kinds of goniophotometers are differentiated according to the measurement planes A, B, or C. By CIE 121-1996, and IES 62384 tester, the goniophotometers that are a part of the LISUN series are classified as type A goniophotometers. They are the foundational items of the Optronic Line and are the focus of ongoing development.

Uses

A goniophotometer has several potential uses, including:

1.      Quantifying the output of a light bulb

2.      Distribution of light intensity measurements from sources too tiny for conventional goniophotometers to capture

3.      Additional features are measurable using color-sensor-equipped devices.

4.      The intensity of color temperature correlation

5.      Consistency in hue

Types

This article provides definitions for the different kinds of goniophotometers derived from the paper "CIE 70" written by the International Commission on Illumination (CIE).

Type A

The horizontal axis is fixed, while the vertical axis is attached; both axes are perpendicular to the primary direction in which the light source emits light.

Type B

Both the vertical and horizontal axes are immovable and oriented in a manner perpendicular to the principal direction in which the light source emits light. This ensures that the light source is always directed in the desired direction. Types A and B both have structures that are double columns.

This kind is used for the grille light that is fixed in place. In the B-coordinate system, the light's symmetry axis and the spinning supporter's horizontal axis are coaxial. In the A-coordinate system, the two form a vertical Cross.

Type C

Single-column structures with a fixed vertical axis perpendicular to the line of measurement and a horizontal axis parallel to the primary output direction of the light source make up the type C configuration.

When reduced to a single column, the double-column structure results in the formation of the single-column structure. It may use this kind for a spotlight, a fixed tube lamp, or different devices. The vertical axis of the revolving supporter and the horizontal axis of the lamp's emission are coaxial.

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