Goniophotometer: Back to Basics

Goniophotometer Back to Basics

A goniophotometer’s primary function is to measure the light released by an object from different angles. This device has seen a lot of popularity over the last few decades, thanks to LEDs. These light bulbs are a direct source of light. The spatial distribution of light in LEDs is non-homogeneous. We will be discussing some of the most common uses and types this device. Continue reading to learn more.

The distribution of light is determined by the source. A source that is homogeneous in its light source is known as a Lambertian source. Because there are strict guidelines, it is clear that spatial light distribution is very important. This holds true for automotive lighting and design.


Let’s talk about the most common uses for a good goniophotometer. These uses will give you a better understanding of the purpose of these units.




Below is a description of some of the uses of these devices. Although the list isn’t exhaustive, it will give you an idea of the uses for these units.


They can be used to measure the light flux from a source of illumination.


They can measure the luminous intensity of a particular source, which is much smaller than a goniophotometer.


These devices come equipped with color sensors, which can be used to measure color uniformity as well as correlated color temperature distribution.




Let’s now discuss the most common types of goniophotometers. We will also discuss several types of these devices. The type of application and the intended use of the unit will determine which one is best. It is important to be familiar with the differences between these units.

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Type A


This unit has a fixed horizontal and vertical axis that are connected perpendicularly to the primary light output direction.


Type B


This unit comes with both a fixed horizontal axis as well as a vertical axis. They are perpendicular with the primary output direction from the source of light.


Keep in mind that Type A and Type B both have double-column structures. This unit can also be used to adjust grille lamp. The symmetry axis as well as the horizontal spinning supporter can be considered coaxial.


Type C


This type has a fixed vertical direction that runs parallel to the measurement line. The horizontal axis runs parallel to the primary output angle for the source of light.


Keep in mind that type A is also known as single-column structure. This structure is created when the assistant column is removed from the double-column structure.


This type is ideal for fixed spot lamps, tube lamps, and other similar devices. The horizontal rotating support is coaxial with the lamp axis radiation.


This was a short summary of the types and uses of goniophotometers. This article should help you gain a better understanding of these units.