Van Ness BRT Lighting Criteria
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Transcript of Van Ness BRT Lighting Criteria
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Van Ness BRT Lighting Criteria
Lighting Performance Characteristics
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Design Criteria Roadway Classification
MAJOR
Pedestrian Vehicle Conflict
HIGH
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IES RP-08 Illuminance Recommend values
min maintained average1.7 fc
Average to Min Illuminance Ratio
3.0
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Pole Spacing SFPUC 80’-90’ horizontally
MTA pole height 30’
Luminaire height Roadway fixture +30’Pedestrian fixture 16’
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Lamp Characteristics
HPS & LED Characteristics
Lamp Type HPS LED
Lamp Wattage 250 150
Cost / Fixture $900 $2,000
Lumens 28,000 5,780
Lamp Life (Hours) 20,000 50,000
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PHOTOMETRICS 250W HPS
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PHOTOMETRICS 250W HPS
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PHOTOMETRICS LED
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PHOTOMETRICS LED
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Fixture Cutoff
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Full Cutoff
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Full Cutoff
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Cutoff
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Full Cutoff Rendering
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Semi-Cutoff Rendering
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Conclusion Van Ness Corridor vehicular and pedestrian traffic
volume, along with street width require higher lighting levels for safety compared to residential areas.
Current LED technology is suitable for roadways with less traffic and smaller widths. A LED design for Van Ness would require additional fixtures and/or closer pole spacing to provide required lighting levels.
Full cutoff fixtures will reduce the pole spacing requirements as well as induce shading in the pedestrian right of way.
Cutoff or Semi-Cutoff fixtures will reduce Sky Glow (light pollution) while maintaining suitable pole spacing, and comfortable levels of fill light.
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Questions