Van Ness BRT Lighting Criteria

Lighting Performance Characteristics

Design Criteria Roadway Classification

MAJOR

Pedestrian Vehicle Conflict

HIGH

IES RP-08 Illuminance Recommend values

min maintained average1.7 fc

Average to Min Illuminance Ratio

3.0

Pole Spacing SFPUC 80’-90’ horizontally

MTA pole height 30’

Luminaire height Roadway fixture +30’Pedestrian fixture 16’

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

PHOTOMETRICS 250W HPS

PHOTOMETRICS 250W HPS

PHOTOMETRICS LED

PHOTOMETRICS LED

Fixture Cutoff

Full Cutoff

Full Cutoff

Cutoff

Full Cutoff Rendering

Semi-Cutoff Rendering

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.

Questions