Energy-efficient Lighting For Streets And Public Spaces In Boston – The use of higher visibility is one of the main reasons for outdoor luminaires. Higher and accurate lighting can better support people to recognize and avoid dangerous situations at night. With safety in mind, use the energy-saving and efficient luminaires to create comfortable and beautiful lighting. Distribution is one of the key factors in evaluating lighting efficiency. Therefore, proper distribution of LED light is important for outdoor luminaires. For a street area, we would be concerned about the safety of both drivers and passengers. Intensity, brightness, brightness, light coverage and other factors make up the LED lighting circuit. The type of circuit classified by many groups, which aims to select the most suitable LED light according to different road conditions and ensure safety. This post will introduce the main factors and classifications for LED circuit types.
IES (Illumination Engineering Society), develops lateral light distribution in terms of the width of the light field which is defined as a multiple of the mounting height (MH). The width of the half-maximum candela trace within the longitudinal distribution is used in a distribution range (Short, Medium or Long). The limits for each classification in relation to Long Term Road Lines (LRL, running on the road) are as follows:
- 1 Energy-efficient Lighting For Streets And Public Spaces In Boston
- 1.1 Photovoltaic (pv) And Solar Lighting System Testing And Certification
- 1.1.1 Lighting Design Guidance
- 1.1.2 Led Streetlights In Brooklyn Are Saving Energy But Exhausting Residents
- 1.1.3 The Lights Have Been On At A Massachusetts School For Over A Year Because No One Can Turn Them Off
- 1.1.4 Police Praise ‘smart Street Light’ Program As A Crime Solving Tool; Wary Critics Want More Oversight
- 2 Everything You Need To Know About Outdoor Led Lighting
- 3 Psc Oks Rates For Mon Power/potomac Edison To Provide Led Street Lights, But Not The Rates They Asked For
Energy-efficient Lighting For Streets And Public Spaces In Boston
A narrow symmetrical pattern, half-maximum candela detection falls between 1 MH on the house side and 1 MH on the street side of the luminaire’s position. It is ideal for walkways, paths, roadways and “tall tree” applications because it is a two-way lateral circulation preferred with a width of 15 degrees that highlights the opposite.
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Narrow asymmetric pattern, half-maximum candela detection falls between 1 MH and 1.75 MH on the street side of the luminaire’s position. It is used for footpaths, roadways and cycle paths. The preferred lateral width of 25 degrees is for larger light areas.
Wide asymmetric pattern, half-maximum candela detection falls between 1.75 MH and 2.75 MH on the street side of the luminaire’s position. This type of distribution allows the light to go out and fill the area with the preferred lateral width of 40 degrees. It is meant for driveway, parking, other area lighting applications.
Asymmetric forward throw pattern, half-maximum candela detection falls beyond 2.75 MH but less than 3.7 MH on the street side of the luminaire’s position. The preferred lateral width is 60 degrees. Ideal for wall edge or pole mounting applications.
A symmetrical circular pattern, with a distribution that is symmetrical around the position of the luminaire. It provides equal light distribution forward and backward. It is best for parking and area lighting.
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A square patter is symmetrical, with a square symmetry of candle power that is more or less the same at all lateral angles. It is suitable for large areas, such as the parking lot and the areas that need enough and evenly distributed light.
In addition to these types, the light circuit can be classified as Short (S), Medium (M), or Long (L). This refers to the vertical light distribution of the luminaire and is based on where the maximum intensity (candela value) points in the grid, given in TRL (Transverse Roadway Lines) as a multiplier of climbing height (MH). The direct distribution categories are defined as follows:
The amount of glare produced by a luminaire is greatly affected by intensity emitted at angles close to the horizontal. Glasses and light emissions are dangerous for drivers. The more balanced the light, the more comfortable the drivers would feel. Therefore it is necessary to regulate the cutting classification, which is based on the effect of light on glare at a vertical angle of 80 degrees to 90 degrees.
Luminaire light distribution whose intensity does not exceed 20% of the indicated light at a vertical angle of 80 degrees from above nadir, and the intensity cannot exceed 5% of the indicated light lumens at 90 degrees from nadir. This applies to all lateral angles around the luminaire.
Lighting Design Guidance
Luminaire light distribution whose 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 above nadir.
Luminaire light distribution that the intensity is zero above 90 degrees from nadir, which means that the light only hits the ground below. And the intensity must not exceed 10% of the indicated light lumens at or above 80 degrees. This applies to all lateral angles around the luminaire.
There is a vedio about LED lighting distribution of street light as follows. Hope it helps you to understand better.
“BUG” refers to the luminaire’s external distribution and light pollution potential, “B” for backlight, “U” for light directed upwards above the horizontal plane of the luminaire, “G” for glare (high angle lights on). The BUG rating evaluates the light’s optical performance, sky glare and high-angle brightness. The stray light is divided into subzones as different angles.
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The BUG rating is calculated from a 0-5 rating per category, “0” is the least spill lumens and “5” is the highest spill lumens.
CIE (International Commission on Illumination), a non-profit, non-governmental commission, is dedicated to increasing lighting efficiency, reducing energy consumption and pollution. CIE classified the enclosure by lighting and cutting optics.
According to the maximum brightness of 90% of the central axis of the luminaire and the area covered by direct irradiation of the luminaire to the road, the light distribution is divided into narrow, medium and wide.
The direction of maximum light intensity is between zero degrees to 65 degrees. The maximum light intensity must be less than 10cd/1000lm at 90 degrees and less than 30cd/1000lm at 80 degrees.
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The direction of maximum light intensity is between zero degrees to 75 degrees. The maximum light intensity must not exceed 50cd / 1000lm at 90 degrees and less than 100cd / 1000lm at 80 degrees.
NEMA (National Electrical Manufacturing Association), develops the lighting circuit classification, which is used primarily for flood lights and sports lighting fixtures. It describes the distribution of light within the beam that the fixture produces.
The beam spread is between 10 degrees and 18 degrees, defined as “Very Narrow” with a projection distance of 240 feet or more.
A beam spread angle greater than 18 degrees but less than 29 degrees, is defined as “Narrow” with a projection distance between 200 and 240 ft.
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The beam spread angle is greater than 29 degrees but less than 46 degrees, described as “Medium Narrow” with a projection distance of 175 feet to 200 feet.
Beam spread angle is 47 degrees to 70 degrees, defined as “Medium” with projection distance from 145 ft to 175 ft.
The beam spread angle is greater than 70 degrees and less than 100 degrees, defined as “Medium wide” with a projection distance from 105 ft to 145 ft.
The beam distribution angle is greater than 100 degrees and less than 130 degrees, defined as “Wide” with a projection distance from 80 feet to 105 feet.
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NEMA indicates the horizontal and vertical beam distribution angles of the flood light. If a flood light of 50 degrees is distributed with a horizontal beam and 50 degrees of vertical beam distribution, the NEMA type is 4 X 4. Different flood distributions provide more accurate solutions for multiple applications.
The street lights would flash when it gets dark. The lights illuminate the road to help us see more clearly. But the street lights are not placed randomly. To provide security and value clarity for passengers and drivers, they are carefully designed according to the length, width and clarity of the road needs. With heightened awareness of environmental protection, people are experiencing a higher demand for lighting quality. Therefore, more attention is paid to light pollution. Street lighting requires strict lighting angles and coverage to protect people around from disturbing them such as excessive brightness that would be harmful to the eyes. All classifications and regulations of street lighting and area lighting are aimed at ensuring safety for people and the environment. A careful selection of light distribution will help the visual environment to be evenly illuminated, with luminaires widely distributed at angles low enough to prevent excessive brightness and glare and increase visibility and security.
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Psc Oks Rates For Mon Power/potomac Edison To Provide Led Street Lights, But Not The Rates They Asked For
IMPA received the $5 million Energy Efficiency and Conservation Block Grant in 2010 as part of the American scheme.
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