Guide beam angle

Guidebook Beam angle for LED lighting


The Beam angle or Half-value angle of a luminaire is the light cone in which the light is emitted by the light source. In this area, the luminaire emits at least half the maximum luminous intensity. The beam angle is specified in the unit degrees (°). 

Round Hall spotlight for the suspended 1-point mounting thereby form a rotationally symmetrical light conethus an evenly round cone of light. Also Spotlight and LED panels produce an approximately symmetrical light cone, although this is usually not exactly round due to the design. Streetlights and Floodlight form a special light cone with the aim of illuminating as wide an area as possible. At LED tubes (LED fluorescent tubes) it concerns a Illuminant with a very wide beam angle of usually 330°, whereby the light cone is only focused when the LED Tube is installed in a luminaire (e.g. diffuser luminaire).

The full luminosity is only achieved in the center of the light cone. The further to the edge of the light cone, the more the strength of the light decreases. In the outer area of the light cone, the so-called field angle, the luminosity is only 10 %. This area is no longer part of the radiation angle.

The exact details of the light distribution of our luminaires can be found in the measurement report or in the light distribution curve, which you can download directly in the product description.

For general lighting, a beam angle of 120° is recommended in most cases. Smaller beam angles result in a smaller or more focused light cone and are suitable for targeted spot lighting or for particularly high hall surfaces.