What Is Beam Angle in Lighting?
Beam angle is the measurement of how wide a beam of light spreads from a fitting. It is expressed in degrees and tells you the angle at which light intensity drops to 50% of its peak output. The wider the angle, the broader the spread of light. The narrower the angle, the more concentrated and intense the beam.
What Do Different Beam Angles Actually Look Like?
A 10 degree beam is a tight, focused spot. A 120 degree beam is a broad wash that covers a wide area. Everything in between is a sliding scale between intensity and coverage. A narrow beam throws light further and harder. A wide beam softens and spreads it. Neither is better than the other. Both serve different purposes depending on the space and the application.
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How Is Beam Angle Measured?
From the centre of the beam outward on both sides. A 60 degree beam spreads 30 degrees to the left and 30 degrees to the right of the central axis. This is worth understanding because it directly determines the diameter of light on any given surface, which changes depending on how high up the fitting is mounted.
Why Does Beam Angle Matter More in Linear Lighting Than You Think?
Because linear fittings distribute light along a continuous run rather than from a single point. Get the beam angle wrong on one downlight and you have a patch. Get it wrong on a 3 metre linear run and the entire zone is either harshly over-lit or noticeably flat. The consequences are bigger and they are much harder to fix after installation.
How Does Ceiling Height Change Which Beam Angle I Need?
Higher ceilings need tighter angles. At standard commercial heights of 2.4 to 3 metres, a 90 to 120 degree beam from a suspended linear delivers even, practical coverage. Above 3.5 metres, that same wide angle disperses too much on the way down and lux levels at desk or floor level drop significantly. Pull back to 60 to 90 degrees and adjust spacing accordingly.
It is also worth noting that peak lumen figures on spec sheets do not account for real-world dispersion. A fitting quoted at high output with a wide beam may still fall short of the required lux at the work surface. We suggest working with our lighting design team for exact specifications.
What Beam Angle Should I Use for Ambient Linear Lighting?
90 to 120 degrees at standard ceiling heights. For suspended or surface-mounted linear fittings used for general ambient light, the goal is uniform, even coverage across the space rather than concentrated intensity at a single point. A wide beam from a continuous linear run achieves this naturally and avoids the pooling effect you get from individual point sources.
What Beam Angle Do I Need for Track Lighting?
It depends on what the track is doing. 15 to 30 degrees works well for retail display and product accent. 30 to 45 degrees suits desk-level task zones, giving you intensity without a harsh cut-off. 10 to 20 degrees is the right territory for architectural detail and wall grazing.
The advantage of track over fixed linear is that you can mix beam angles across the same run without changing the system. Narrower fittings where you need focus, wider angles where you need fill. For our range of track lighting, please see here.
What Beam Angle Should I Use for Architectural and Feature Linear Lighting?
10 to 20 degrees. When a linear fitting is grazing a textured wall, highlighting a structural detail or acting as a feature in its own right, tight beam control is what creates depth and shadow. A wider angle washes the surface flat and loses the effect entirely.
Quick Reference: Beam Angles for Linear and Track
| Application | Beam Angle |
|---|---|
| Suspended ambient, standard ceiling height | 90° to 120° |
| Suspended ambient, above 3.5m | 60° to 90° |
| Track, desk and task zones | 30° to 45° |
| Track, retail and product display | 15° to 30° |
| Architectural feature and wall grazing | 10° to 20° |
| Corridor and circulation runs | 90° to 120° |
Figures are indicative. Ceiling height, fitting spacing and lux targets should always be verified with a photometric calculation before finalising your specification.
When Do I Need a Full Photometric Calculation?
When the space is complex or lux compliance is required. Mixed-use schemes, variable ceiling heights and projects with mandated lux levels all need proper photometric calculations rather than a reference guide. Beam angle errors are among the most common causes of remedial work on commercial fit-outs. The specification looks right on paper but does not perform once installed.
Our free lighting design service covers beam angle selection, spacing and lux verification before anything is ordered.
