Goniophotometer: Back to Basics

Basically, the role of a goniophotometer is to help measure the light released from an object at varying angles. Over the past few decades, the use of this device has been on the rise, especially due to the advent of LEDs. These light bulbs are on the list of directed sources of light. In LEDs, there is a non-homogeneous, the spatial distribution of light. In this article, we are going to talk about some common uses and types of this device. Read on to find out more.

When it comes to the distribution of light, when the source of the light is homogeneous, it’s known as Lambertian source. Since there are strict regulations, we can say that there is a lot of importance in the spatial light distribution. This is true when it comes to automotive design and lighting.

Let’s know talk about some common uses of a good goniophotometer. The description of the uses will help you get a much better idea of the role of these units.


Given below is the description of the applications of these devices. The list is not complete but it will give a glimpse of what the units are used for.

They can help measure the luminous flux of a source of light

They can help measure the respective luminous intensity from a specific source that is a lot smaller compared to goniophotometer size

They come with color sensors that can help measure color uniformity and correlated color temperature distribution.


Now, let’s discuss some common types of goniophotometers. In other words, we are going to define several types of these devices. The choice of a unit depends on the type of application and its uses. Therefore, it’s important to understand the different types of these units.

Type A

This type of unit features a fixed horizontal axis and vertical axis connected perpendicular to the primary output direction of the source of light.

Type B

This one comes with a fixed vertical axis and a horizontal axis attached. They are perpendicular to the primary output direction of the source of light.

It’s important to keep in mind that both Type A and Type B are called double-column structures. Apart from this, this type of unit is used to adjust the grille lamp. In addition, the symmetry axis and the horizontal spinning supporter are kind of coaxial.

Type C

This type features a fixed vertical axis that is perpendicular to the measurement line. Also, the horizontal axis is parallel to the primary output angle of the source of light.

It’s important to keep in mind that type C is known as single-column structures. This type of structure is formed when you take down the assistant column from the given double column structure.

Generally, this type is an ideal choice for a fixed spot lamp, tube lamp, and other devices of this sort. Also, the horizontal rotating support and lamp axis radiation is coaxial.

In short, this was a brief description of the uses and types of goniophotometers. Hopefully, this article will help you get a much better understanding of these units.