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Electrical Applications 2 by David W. Tyler

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114
Illumination
the results on polar graph paper is referred to as the polar diagram.
Such
a
curve
for the
lamp
and
reflector
in
Figure
7.8 is shown
in
Figure 7.9
The light radiating capability
of the
fitting
is
scaled from
the
origin 0 in the direction required. For instance, directly downwards
it is
1000
candelas whilst in the horizontal direction
it
is only
100
cd.
At 45°
to
the horizontal
it
is
1500
cd.
The light radiating capability above
the
horizontal
is
virtually
zero since this particular fitting
is
designed