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Beam Angles, Throw & Diameter
The table below shows the beam diameter from a luminaire set at a certain beam angle, for various throw distances.
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| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 12.5 | 15 | 17.5 | 20 | 25 | 30 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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5 | 0.09 | 0.17 | 0.26 | 0.35 | 0.44 | 0.52 | 0.61 | 0.70 | 0.79 | 0.87 | 1.09 | 1.31 | 1.53 | 1.75 | 2.18 | 2.62 |
| 10 | 0.17 | 0.35 | 0.52 | 0.70 | 0.87 | 1.05 | 1.22 | 1.40 | 1.57 | 1.75 | 2.19 | 2.62 | 3.06 | 3.50 | 4.37 | 5.25 | |
| 15 | 0.26 | 0.53 | 0.79 | 1.05 | 1.32 | 1.58 | 1.84 | 2.11 | 2.37 | 2.63 | 3.29 | 3.95 | 4.61 | 5.27 | 6.58 | 7.90 | |
| 20 | 0.35 | 0.71 | 1.06 | 1.41 | 1.76 | 2.12 | 2.47 | 2.82 | 3.17 | 3.53 | 4.41 | 5.29 | 6.17 | 7.05 | 8.82 | 10.58 | |
| 25 | 0.44 | 0.89 | 1.83 | 1.77 | 2.22 | 2.66 | 3.10 | 3.55 | 3.99 | 4.43 | 5.54 | 6.65 | 7.76 | 8.87 | 11.08 | 13.30 | |
| 30 | 0.54 | 1.07 | 1.61 | 2.14 | 2.68 | 3.22 | 3.75 | 4.29 | 4.82 | 5.36 | 6.70 | 8.04 | 9.38 | 10.72 | 13.40 | 16.08 | |
| 35 | 0.63 | 1.26 | 1.89 | 2.52 | 3.15 | 3.78 | 4.41 | 5.04 | 5.68 | 6.31 | 7.88 | 9.46 | 11.04 | 12.61 | 15.76 | 18.92 | |
| 40 | 0.73 | 1.46 | 2.18 | 2.91 | 3.64 | 4.37 | 5.10 | 5.82 | 6.55 | 7.28 | 9.10 | 10.92 | 12.74 | 14.56 | 18.20 | 21.84 | |
| 45 | 0.83 | 1.66 | 2.49 | 3.31 | 4.14 | 4.97 | 5.80 | 6.63 | 7.46 | 8.28 | 10.36 | 12.43 | 14.50 | 16.57 | 20.71 | 24.85 | |
| 50 | 0.93 | 1.87 | 2.80 | 3.73 | 4.66 | 5.60 | 6.53 | 7.46 | 8.39 | 9.33 | 11.66 | 13.99 | 16.32 | 18.65 | 23.32 | 27.98 | |
| 55 | 1.04 | 2.08 | 3.12 | 4.16 | 5.21 | 6.25 | 7.29 | 8.33 | 9.37 | 10.41 | 13.01 | 15.62 | 18.22 | 20.82 | 26.03 | 31.23 | |
| 60 | 1.15 | 2.31 | 3.46 | 4.62 | 5.77 | 6.93 | 8.08 | 9.24 | 10.39 | 11.55 | 14.43 | 17.32 | 20.21 | 23.09 | 28.87 | 34.64 | |
| 65 | 1.27 | 2.55 | 3.82 | 5.10 | 6.37 | 7.64 | 8.92 | 10.19 | 11.47 | 12.74 | 15.93 | 19.11 | 22.30 | 25.48 | 31.85 | 38.22 | |
| 70 | 1.40 | 2.80 | 4.20 | 5.60 | 7.00 | 8.40 | 9.80 | 11.20 | 12.60 | 14.00 | 17.51 | 21.01 | 24.51 | 28.01 | 35.01 | 42.01 | |
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- The formula for working out the beam diameter is given as:
- d = 2t x tan(a/2)
- where:
- d: beam diameter;
- t: throw length;
- a: beam angle.
- t: throw length;
See also:
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