Beam Height Multiplier Table
Formula-derived beam diameter multipliers for common beam angles, expressed as diameter per metre of effective height.
Table PDFBeam Height Multiplier Table
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| Beam angle | Diameter per 1 m effective height | Example at 2.4 m effective height | Boundary |
|---|---|---|---|
| 15 degrees | 0.26 m | 0.63 m | Narrow accent geometry only; it does not predict delivered lux or uniformity. |
| 24 degrees | 0.43 m | 1.02 m | Small footprint for accent or high-mount checks before aiming and glare review. |
| 36 degrees | 0.65 m | 1.56 m | Medium-narrow beam geometry to compare before spacing or wall-wash notes. |
| 60 degrees | 1.15 m | 2.77 m | Common downlight geometry input; task-plane light still depends on output, UF and MF. |
| 90 degrees | 2.00 m | 4.80 m | Wide beam footprint; glare, edge spill and overlap still need separate attention. |
| 120 degrees | 3.46 m | 8.31 m | Very wide distribution can brighten broad areas while reducing control and contrast. |