4-7.7.3
Shielding
Devices
Louvers:
A device that im-
A.
p r o v e s the cut-off angle
c h a r a c t e r i s t i c s and reduces
glare.
Materials are plastic
or metal , used in a one-way
or two-way configuration. (1)
A device that
B. D i f f u s e r s :
l o w e r s the surface bright-
n e s s of the light source by
s p r e a d i n g it over a greater
area.
Materials are frosted
translucent glass or
plastic. (2)
C . Lenses:
A device that im-
p r i n t s some photometric
pattern to the light.
Materials are glass or
plastic, and typical config-
urations are prismatic,
ribbed, striated and
polarized. (3)
4-7.7.4
Controls
Direct, or low
A.
Circuiting:
voltage.
B.
Devices:
One-way switch,
t h r e e - w a y switch, zone
switching, automatic switch-
i n g , dimming.
4-7.7.5
Special
Components
A. A i r D i f f u s e r :
Light troffer
u n i t s can be provided with
integral air diffusers
apertures. (4)
B. N o n - c o r r o s i v e C o n s t r u c t i o n :
C a n be provided when required,
e.g., kitchen.
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