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The light distribution of a floodlight is referred to as "beam
spread" and is classified by its "NEMA type". The NEMA beam
spread indicates the two edges where the light intensity photometric spreads
horizontal and vertical to 10% of the maximum beam intensity.
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For example: |
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|
Asymmetrical beam spread |
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138°
(H) x |
119°
(V) |
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Horizontal |
Vertical |
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= NEMA 7 x 6 |
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NEMA Beam Spread Classifications |
| Beam Spread Degrees |
NEMA Type |
Beam Description |
| 10°
up to 18° |
1 |
very narrow |
| 18° up
to 29° |
2 |
narrow |
| 29° up
to 46° |
3 |
medium narrow |
| 46° up
to 70° |
4 |
medium |
| 70° up
to 100° |
5 |
medium wide |
| 100°
up to 130° |
6 |
wide |
| 130°
and up |
7 |
very wide |
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