Beam Angles Explained
Narrow, medium, wide, what beam angle actually does, and how to choose it based on mounting height, target and application.
What Beam Angle Is
Beam angle is the cone within which a fixture delivers at least 50% of its peak intensity. It controls how concentrated or spread the light is on the target surface.
Reference Table
| Beam | Type | Use |
|---|---|---|
| 10°–15° | Spot | Single object, sculpture, jewellery |
| 15°–24° | Narrow flood | Accent on art, retail spots |
| 24°–40° | Medium | Downlight, general task |
| 40°–60° | Wide | Ambient wash, low ceilings |
| 60°+ | Very wide | Soft ambient, indirect |
Mounting Height Matters
The same fixture with the same beam delivers a very different pool of light at 2.7m vs 4m. Higher ceilings usually need narrower beams to maintain useful lux on the working plane.
The Quick Geometry Rule
Diameter of the lit pool ≈ 2 × mounting height × tan(beam angle / 2). Useful as a sanity check on site.
Common Mistakes
- Using a single beam angle everywhere on a project
- Wide beams in high ceilings, light spreads too thin
- Narrow beams in low ceilings, harsh hotspots
Specify the beam, not just the fixture. Two identical-looking spots with different beams behave like different products.
Lighting Intelligence by Alya
At Ashwamedha Design Solutions, this is part of our Lighting Intelligence practice, every recommendation is validated through DIALux simulation, lux calculations and visual comfort analysis before it reaches a construction site. Alya, our lighting intelligence platform, packages this thinking into reusable design tools.
Frequently Asked Questions
What beam angle is best for residential downlights?+
Most homes use 36°–60° general downlights in living areas and 24°–36° accent beams on art or features.
What is a narrow flood?+
A 15°–24° beam, narrow enough to highlight an object without becoming a hard spot.
Can I change the beam on a fixture?+
Some fixtures accept interchangeable lenses or reflectors, particularly track and recessed adjustable spots.
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