The second is to increase the area from which
light is emitted (figure 3.32). A white glass
globe and diffusing panels of white glass or
plastic are examples.
The automobile headlights redirected
below the line of sight demonstrates the
third technique whereby directional control
and change in the direction of the beam
(figure 3.33) aid visual comfort. This third
method is more efficient; it uses accurate
control devices to redirect light in the desired
direction. Typical devices are reflectors and
refracting lenses that limit the distribution of
stray light emitted toward the eye.
Visual comfortresults from the reduc-
tion of glare and distracting luminance in the
field of view. Excessive luminance is physio-
logically disconcerting and reduces the abil-
ity to see detail accurately. The quality and
comfort of vision depend upon the avoid-
ance of distracting or disabling luminances.INTERIOR LIGHTING FOR DESIGNERS
Figure 3.32Increasing the area from which light is emitted.Figure 3.33Change in the direction of the beam to
control direct glare.