# Beam Spread

**Definition:** With regard to outdoor light, the angle between the two directions in a plane in which the intensity is equal to a stated percentage of the maximum beam intensity. The percentage is typically 10% for floodlights and 50% for roadway luminaries.

## Related Links

What is beam spread?

Pocket Guide: Beam Spread – Flip The Switch

Transducer Beam Spread

Light Bulb Beam Spread Chart – Calculate the beam spread of light

Floodlighting Design Guide | Lithonia Lighting

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