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Luminance (Lux) measurement
a. Mount Lumidisc
Lumisphere.
to light sensor
in the same manner as
b. Place Lumidisc
parallel with the measured surface.
and read meter scale footcandle
c. Press stopper button
indication
d. Multiply this value by 10.76 to obtain lux.
Example: 80 x 10.76 = 860.8 lux
If meter deflects beyond scale, insert High slide
then multiply
footcandle indication by 32.
Example: 80 x 32 = 2560 footcandles
2560 x 10.76 = 27545.6 lux
a. Mount Lumigrid
sensor
in the same manner
as Lumisphere.
b. Set sensitivity value of employed film.
Setting is performed in the same
manner as for incident light
measurement.
c. Point Lumigrid
toward 'part of subject to be
measured.
d. As close as possible to the subject,
measure reflected light from main
point of subject. Use adequate care
at this time that meter shadow etc.
does not interfere.