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HOMEPRODUCTS Beam Angle & Field Angle

 

 
What is Beam Angle and field Angle?
 

What is Beam Angle
Beam angle refers to the angle between the two planes of light where the intensity is at least 50% of the maximum intensity at center beam. The average beam angle on most par lights is 25 degree and will work well for most purposes.

What is Field Angle?
Field angle refers to the angle between the two planes of light where the intensity is 10% (or less) of the maximum intensity at center beam. This is sometimes referred to a ghosting or spill, it is not considered usable light. The type of lens used in the fixture will usually determine the amount of field angle or spill.  For example, a lens that has a textured surface or frosted coating will create a wider field angle. This is because the textured surface on the lens (or frosting) will improve color mixing, but also diffuses the light and creates softer edges along the beam creating a wider field angle, and more spill. 

LED Lens
The beam angle is determined by the type of lens used in your LED fixture. Below are 2 examples of common lenses. The smaller lens on the left is typical in RGB fixtures (one color lamp under each lens) and this sample is a 25 degree lens. Beam angles ranging from 10 degree (narrow) to 60 degree (wide) are common. The lens on the right is a larger lens and this type is common on Quad-LED fixtures in which all 4 LED color lamps are located under each lens, hence the reason for the larger size. See this page for more info on Quad-LED. These larger lenses usually have wider beam angles of 25 - 60 degrees. Notice the textured surface, the purpose of this is to produce better color mixing. However, the textured surface will reduce beam intensity by a small percentage.
 

The size and shape of the area
indicated by the red circle is what  determines the beam angle.

Typical 25 degree lens, appx 3/4" in diameter

Quad-LED lens
with textured surface,
appx 1" in diameter

 

 
beam angle vs field angle photo
 

The charts below represent the approximate beam spread of a light source at varying distances using a 10, 15, 25, and 45 lens.

 
10 Beam spread

15 Beam spread
25 Beam spread
45 Beam spread
 
 
 

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