BEAM ANGLE & IT's APPLICATION

LEDs are directional light sources. Therefore, especially after the introduction of LED technology into our lives, the concept of light angle was taken into consideration by the consumer. Because beam angle was actually an important element that determining how to do the lighting.

Light beam angle is an angular expression that shows how light emitted from a light source, it indicates the angle at which the luminous flux passes out of the LED light. Depending on the distance between the lamp and the floor or the illuminated surface, this creates a light cone with a corresponding diameter. The beam angle has a direct influence on how large the produced light cone appears in the room. 

Light sources can be defined as narrow angle from 5 to 45 degrees, wide angle from 45 to 120 degrees.

Depending on the distance between the lamp and the floor or the illuminated surface, this creates a light cone with a corresponding diameter. The beam angle has a direct influence on how large the produced light cone appears in the room. 

Field Angle

Besides the beam angle there is also the so-called field angle. In the light circle, the beam angle defines the area where the lamp radiates at least half (50%) of its maximum luminous intensity. The full luminous intensity (100%) is only achieved exactly in the center of the light circle.

The field angle defines the outer area in the light circle where the lamp radiates up to one tenth (10%) of its maximum luminous intensity. Even outside the field angle it is not completely dark, small parts of the luminous intensity are still emitted here as scattered light.

Beam angle & Light intensity

Smaller beam angles such as 25° to 45° will produce a more focused beam of higher intensity and are more suited to spot lighting in commercial or artistic applications. Larger beam angles from 60° to 135° will produce a broader beam suited for most residential applications or ambient lighting in commercial applications.

Buildings with very high ceilings of 3m or greater may also benefit from more focused beam angles. Larger beam angles are useful in lower ceiling applications (< 3m). Whereas a 45° beam spread may be more useful in higher ceiling applications or for corridor lighting.

A LED light bulb with a narrower beam angle may also seem brighter but the overall total luminous flux will be the same as the same LED light bulb with a lens which produces a wider beam angle. The brighter light is created by focusing the light within a more localized area. The beam angle should therefore always be chosen in conjunction with the desired brightness according to the surface to be illuminated.

Beam Angle and Height

If it is an interior place, the beam angle should be selected depending on the ceiling height. If it is an outdoor place, the beam angle should be selected depending on the height of pole or the height of the place. Wide angle light sources should be preferred at low points, narrow angle light sources should be preferred at high points according to the surface to be illuminated.

If you place wide angle lighting fixture at a high point, the light will dissipate before it reaches the ground. Therefore, it will not provide sufficient light. On the other hand, if you place narrow angle lighting fixture at a low point, it only illuminates a small area. There will be dark spots and you will not be able to achieve a homogeneous lighting.

Application 

For living rooms and lounge areas that don’t require as much light, a wider beam angle of around 60 degrees might be all that you need for your overhead lamps. A beam angle of 120° is a good choice for the basic lighting of a room.

For corridors and pathways within a room, a beam angle of 90° is good enough.

In areas with higher ceilings, such as in stairwells, a narrower beam angle will likely be necessary to properly illuminate the target area. For ceilings 3 meters or higher, a beam angle of 25 degrees or narrower is recommended.

When it comes to commercial lighting, efficiency, effective task lighting, and aesthetics are often the most important factors when selecting beam angle. Narrower beam angles are the most popular for commercial use because businesses typically have different lighting needs and higher ceilings than residential buildings.

Accent lighting is used to highlight certain areas in a room. This can be a sitting area or a colored wall. Here, the beam angle must be selected individually, depending on the size of the area to be emphasized.

Decorative lighting is often used to highlight certain objects in a room. This can be an art object or a picture. Also here the beam angle depends on the diameter of the object and the distance to the light source.

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