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Guide to beam angles

Guide Radiation Angle for LED Lighting


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


Round indoor floodlightsfor suspended 1-point mounting thereby form a rotationally symmetrical light cone, i.e. a uniformly round light cone.Also spotlightsand LED panels produce anapproximately symmetrical cone of light, although this is usually not exactly round due to the design.street lanternsand floodlights create a special cone of light with the aim of illuminating an area as wide as possible.With LED tubes (LED fluorescent tubes) it is a lighting element with a very wide beam angle of usually 330°, whereby the light cone is only bundled by the installation of the LED Tube in a luminaire (e.g. tub light).

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