22 August 2006
2-2.1.2 Way finding refers to the visual guidance provided by the lighting system and
the visual elements illuminated. This visual guidance may be illuminated signage that
directs occupants to various destinations, or it may be more subtle aids such as
continuity and hierarchy of lighting equipment that reinforces areas of similar use. By
using the same luminaires for areas of the same use, a consistent pattern is established
that visually guides and orients building occupants. Accent lighting can also be used to
draw attention to specific areas by increasing the brightness.
2-2.1.3 In exterior applications, the size and type of lighting equipment provides visual
cues about the surroundings. Bollards and low pedestrian scale poles often signify
pedestrian walkways or plazas. Roadway poles may alert pedestrians to intersections
in the same way that pedestrian poles or bollards may alert motorists to crosswalks.
Direct glare is caused by excessive light entering the eye from a bright light
source. The potential for direct glare exists anytime one can "see" a light source. With
direct glare, the eye has a harder time seeing contrast and details. A system designed
solely on lighting levels, tends to aim more light directly towards a task, thus producing
more potential for glare. The effective use of indirect light minimizes the negative
effects of direct glare. In some circumstances such as entries and checkpoints, glare
can be used to increase vertical illuminance on approaching vehicles or individuals
while increasing visibility for guards and patrols.
2-3.1.1 Causes of direct glare include an exposed bright light source, for example an
HID high bay luminaire, or an exterior floodlight. Overhead T5HO fluorescent lamps in
a downlight also can cause direct glare.
2-3.1.2 Direct glare can be minimized with careful equipment selection and
placement. In interior applications, indirectly light the walls and ceiling. A limited
amount of direct light can provide accent and task lighting. In exterior applications, use
fully shielded luminaires that directs light downwards towards the ground or a building