FLOODLIGHT BEAM SPREAD
& ROADWAY DISTRIBUTION

This section aims to explain the basics of Flood Light Beam Spread and Roadway Light Distribution. Here you will learn the different types of light distribution and the range they cover.

FloodLights

“The beam spread of a floodlight is defined as the angle, measured in degrees, between points on a candlepower distribution curve which are 10% of the average maximum candlepower.” The beams are defined by the National Electrical Association in the chart below.

For floodlights that are not a circular pattern: The NEMA numbers may indicate the “H” horizontal width and the “V” vertical width of the beam. Example: 5H x 1V – Type 5 Horizontal and Type 1 Vertical indicates that the beam is horizontally wide [between 70° and 100°] and vertically narrow [ between 10° and 18°].

NOTE: MagniFlood DOES NOT recommend the 10% of maximum beam theory for quality engineered layouts, rather 50% of maximum beam should be used. Uniformity gives the best lighting results, although intensity should also be a consideration [10% of maximum beam candlepower is a percentage recommended by the Illuminating Engineering Society.]

ROADWAY LUMINAIRES

The diagrams below are the angular ranges that define the five basic roadway distributions that are used for roadway lighting. They represent the area of distribution of a half maximum candlepower They represent the area of distribution of a half maximum candlepower isocandela trace within the longitudinal range in which the point of maximum candlepower falls.

TYPE I

Preferred width 15°, Acceptable range 10° to less than 30°

TYPE II

Preferred width 25°, Acceptable range 20° to less than 30°

TYPE III

Preferred width 40°, Acceptable range 30° to less than 50°

TYPE IV

Preferred width 60°, Acceptable range 50° or wider.

TYPE V

Distribution is 360° which is symmetrical around the luminaire.

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