Street lights illuminate the roads when it gets dark, enhancing visibility for everyone. However, these lights are not placed randomly. To ensure security and provide adequate brightness for pedestrians and drivers, street lights are carefully designed according to the length, width, and brightness requirements of the road.

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Height 6000 mm 1° stretch H 4200 mm – Ø 127 mm 2° stretch H 3000 mm – Ø 76 mm Spigot projection 430 mm Spigot Ø 76 mm In-ground 800 mm

Table of ContentsIES ClassificationsLateral Light DistributionVertical Light DistributionCutoff OpticsBUG RatingCIE ClassificationLighting ProjectionCutoff OpticsNEMA Classification

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With growing awareness of environmental protection, there is an increasing demand for higher light quality. As a result, more attention is being paid to light pollution. Strict requirements govern the angles and coverage of street lights to protect people from the discomfort of excessive brightness, which can be harmful to the eyes. All classifications and regulations for street and area lights are intended to ensure the safety of both people and the environment.

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Careful selection of lighting distribution helps create a visually balanced environment. Luminaires are strategically placed at low enough angles to prevent over-brightening and glare while increasing visibility and security.

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Enhancing visibility is one of the key purposes of outdoor luminaires. Proper and higher-quality lighting can help people better recognize their surroundings and avoid danger at night. With safety in mind, energy-saving and efficient luminaires should be used to create comfortable and aesthetically pleasing lighting.

The direction of maximum lighting intensity is between zero degrees to 65 degrees. The maximum lighting intensity must be less than 10cd/1000lm at 90 degrees and less than 30cd/1000lm at 80 degrees.

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PB pole for public lighting in steel with circular section composed of two tubular elements of different diameters embedded in the side and subsequently welded together. The upper part is equipped with a tang for the assembly of lighting bodies with Ø 76 mm connection. Side spigot for the composition of a double staggered lighting body (optional). The final part with tapered steel tip.

In addition to these types, the light distribution can be classified as Short (S), Medium (M), or Long (L). This refers to the luminaire’ s vertical light distribution and is based on where the maximum intensity (candela value) points to in the grid, given in TRL (Transverse Roadway Lines) as a multiple of mounting height (MH). The vertical distribution categories are defined as follows:

According to the maximum luminosity of 90% of the central axis of the luminaire and the range covered by the vertical irradiation of the luminaire to the road, the distribution of light is divided into Narrow, Medium and Wide.

NEMA(National Electric Manufactures Association), develop the light distribution classification, which is used primarily for flood lighting and sport lighting fixtures. It describes the distribution of light within the beam produced by the fixture.

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The beam spread angle is higher than 100 degrees and less than 130 degrees, described as “ Wide” with projection distance from 80ft to 105 ft.

There is a vedio about LED light distribution of street light as follow. Hope it can help you have a better understanding.

NEMA indicates the horizontal and vertical beam spread angles of the flood light. If a flood light is of 50 degrees horizontal beam spread and 50 degrees vertical beam spread, the NEMA type is 4 X 4. Different flood distributions provide more accurate solutions for multiplex applications.

Symmetrical square patter, has a square symmetry of candlepower that is essentially the same at all lateral angles. It is suitable for large areas, like the parking lot and the areas that require sufficient and evenly distributed light.

A luminaire light distribution that the intensity is zero above 90 degrees from nadir, which means the light will only hit the ground below. And the intensity must not exceed 10% of the rated light lumens at or above 80 degrees. This is applicable to all lateral angles around the luminaire.

Height 7000 mm 1° tratto H 5200 mm – Ø 127 mm 2° tratto H 4000 mm – Ø 76 mm Spigot projection 430 mm Spigot Ø 76 mm In-ground 800 mm

IES(Illumination Engineering Society), develops the lateral light distribution with regards to the lighted area width described as multiple of the mounting height (MH). The width of the half-maximum candela trace within the longitudinal distribution in distribution range (Short, Medium or Long )is used. The boundaries for each classification in terms of Longitudinal Roadway Lines (LRL, running along the roadway) are as follows:

Light distribution is a pivotal factor in evaluating the efficiency of lighting. Therefore, achieving proper distribution of LED light is crucial for outdoor luminaires. For the street area, we concern about the safety of both drivers and passersby. Factors such as intensity, brightness, glare, and lighting coverage contribute to the overall distribution of LED light. Various organizations classify distribution types to select the most suitable LED lighting for different road conditions, ensuring safety.

The beam spread angle is larger than 18 degrees but less than 29 degrees, described as “Narrow” with projection distance between 200 to 240 ft.

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Symmetrical circular pattern, has distribution that is circularly symmetrical around the luminaire position. It provides equal forward and rear lighting distributions. It is best for parking and area lighting.

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PB pole for public lighting in steel with circular section composed of two tubular elements of different diameters embedded in the side and subsequently welded together. The upper part is equipped with a tang for the assembly of lighting bodies with Ø 76 mm connection. Side spigot for the composition of a double staggered lighting body (optional). The final part with tapered steel tip.

“BUG” refers to an outdoor luminaire’s distribution and light pollution potential, “B”for back light, “U” for light directed upward above the horizontal plane of the luminaire, “G” for glare (high angle forward light). BUG rating evaluates the optical performance of lighting trespass, sky glow and high angle brightness. The stray light is divided in to subzones as different angles.

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Height 9000 mm 1° stretch H 7200 mm – Ø 139 mm 2° stretch H 5000 mm – Ø 76 mm Spigot projection 430 mm Spigot Ø 76 mm In-ground 800 mm

Asymmetric forward throw pattern, half-maximum candela trace falls beyond 2.75 MH but less than 3.7 MH on the street side of the luminaire position. It has a preferred lateral width of 60 degrees. Ideal for wall mount or pole mount perimeter applications.

The beam spread angle is over 70 degrees and lower than 100 degrees, described as “Medium Wide” with projection distance from 105 ft to 145 ft.

A luminaire light distribution that the intensity does not exceed 2.5% at or above 90 degrees of the rated lamp lumens from nadir, and the intensity must be less than 10% of the rated light lumens at 80 degrees vertical angle above nadir.

The beam spread angle exceeds 29 degrees but lower than 46 degrees, described as “Medium Narrow” with projection distance from 175 ft to 200ft.

The direction of maximum lighting intensity is between zero degrees to 75 degrees. The maximum lighting intensity must not exceed 50cd/1000lm at 90 degrees and less than 100cd/1000lm at 80 degrees.

Narrow symmetric patter, half-maximum candela trace falls between 1 MH on the house side and 1 MH on the street side of the luminaire position. It is great for walkways, paths, roadway and “high mast” applications as it is a two-way preferred lateral distribution with width of 15 degrees that illuminate in opposite directions.

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CIE (International Commission on Illumination), a no-for-profit, non-government commission, is dedicated to increase lighting efficiency, lower energy consumption and pollution. CIE classified the distribution by lighting projection and cutoff optics.

The amount of glare produced by a luminaire is greatly influenced by intensity emitted at angles close to the horizontal. Glares and the light emission are dangerous for drivers. The more evenly light is, the more comfortable drivers would feel. So it is necessary to regulate the cutoff classification, which is base on the influence of light on glare at 80 degrees to 90 degrees vertical angle.

Wide asymmetric pattern, half-maximum candela trace falls between 1.75 MH and 2.75 MH on the street side of the luminaire position. This type of distributions allowing the light to project outward and fill the area with a preferred lateral width of 40 degrees. It is meant for roadway, parking, other area light applications.

Height 8000 mm 1° stretch H 6200 mm – Ø 127 mm 2° stretch H 4000 mm – Ø 76 mm Spigot projection 430 mm Spigot Ø 76 mm In-ground 800 mm

Narrow asymmetric pattern, half-maximum candela trace falls between 1 MH and 1.75 MH on the street side of the luminaire position. It is used for walkways, roadways and bike paths. It has a preferred lateral width of 25 degrees for larger lighting areas.

A luminaire light distribution that the intensity does not exceed 20% of the rated light at 80 degrees vertical angle from above nadir, and the intensity must not exceed 5% of the rated light lumens at 90 degrees from nadir. This is applicable to all lateral angles around the luminaire.

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