Beam angle explained simply: meaning, values & selection
What Is the Beam Angle?
The beam angle describes the angle at which a luminaire or light source emits its light. It is measured in degrees (°) and determines how wide or narrow the cone of light falls on a surface. A narrow beam angle produces a tightly focused cone of light, while a wide beam angle distributes the light broadly across the room.
The beam angle is measured at the point where the luminous intensity drops to 50% of its maximum value. This is why it is also referred to as the half-peak angle.
What Beam Angles Are Available?
Different beam angles are used depending on the application:
- Very narrow (up to 15°): Accent lighting, display cabinet lighting, spotlighting individual objects
- Narrow (15°–24°): Spot lighting, picture lighting, targeted illumination
- Medium (25°–40°): General lighting, dining table lighting, task lighting
- Wide (40° and above): Area room illumination, ambient lighting, hallways and staircases
- Very wide (120° and above): Omnidirectional light, diffuse lighting
Why Is the Beam Angle Important?
The beam angle is a key factor in determining the effect of a lighting scheme. A tightly focused beam creates strong contrasts and accents, while a wide beam angle provides even illumination. In lighting design, the beam angle is a central parameter – particularly when combining direct and indirect lighting.
Beam Angles in LED Light Sources
Traditional incandescent bulbs emit light in virtually all directions (approx. 360°). LED light sources, by contrast, are inherently directional and, depending on their design, have significantly narrower beam angles. GU10 spots typically feature a beam angle of 24° to 40°. LED filament lamps with an E27 base, on the other hand, achieve close to 300°, making them excellent omnidirectional light sources.
Some luminaires offer the option of adjusting the beam angle using interchangeable lenses, reflectors, louvres or focusing mechanisms. This allows a luminaire to be flexibly adapted to different lighting scenarios.
Frequently Asked Questions (FAQ)
What does the beam angle indicate?
It indicates how wide the cone of light from a light source is – measured at the point where the luminous intensity drops to 50% of its maximum.
Which beam angle for which room?
Narrow angles (10°–24°) are ideal for accent lighting, medium angles (25°–40°) for general lighting, and wide angles (40° and above) for ambient illumination.
Can the beam angle be changed?
Yes, some luminaires allow the beam angle to be adjusted using interchangeable lenses, reflectors, honeycomb louvres or focusing mechanisms.
In summary:
The beam angle is a decisive factor in the lighting effect within a room. It determines whether light creates targeted accents or provides broad, even illumination. When selecting luminaires and light sources, the beam angle should always be chosen in line with the intended application. At Leuchtenland.com, you will find the beam angle listed in the technical specifications for every light source and luminaire.