UFC 3-530-01
22 August 2006
Modeling of Faces or Objects: By providing vertical illuminance from
multiple directions, pedestrians' faces will be visible and accurately
rendered.
Peripheral Detection: Detecting hazards relies heavily on peripheral
vision. Research shows that peripheral vision and detection are enhanced
under white light. White light (as opposed to more orange light produced
by high-pressure sodium) renders objects sharper and provides excellent
peripheral detection compared to high-pressure sodium. Lighting the
facades of surrounding buildings with low glare lighting silhouettes objects
and improves peripheral detection.
Reflected Glare: Consider the potential for reflected glare based on
luminaire location and surface characteristics.
Shadows: Locate luminaires to eliminate shadows that could hide
potential hazards.
Vertical Illuminance: Adequate vertical illuminance lights possible hazards
as well as other pedestrians.
Target Horizontal Illuminance ( 10%): 5 lux (0.5 fc)
DISCUSSION:
Plazas using pedestrian scale poles provide adequate vertical illuminance to light
individuals and their faces. If the luminaires are decorative, a lens or louver should
shield the lamp, prevent direct glare, and minimize the possibility of light trespass. Low
wattage lamps and shielded or cut-off luminaires minimize light pollution.
Selectively lighting the facades of surrounding buildings helps to create the sense of an
exterior space. By silhouetting objects, this technique increases visibility and improves
peripheral detection.
Carefully select features to accent; consider viewing angles, glare, and light pollution
and trespass. Low wattage lamps and the controlled downlighting of surfaces provide
the best opportunities. If uplight cannot be avoided, control the light so that the
luminaires are lighting the feature only, minimizing spill. Shield the luminaires to
prevent glare and light trespass and minimize light pollution. Consider using the lighting
only at specific times or for special occasions.
Locate poles in paved areas when possible to avoid blocking irrigation spray heads.
When luminaires are positioned in planting areas, locate in shrub rather than lawn areas
to avoid damage from mowing and edging.
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