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10
may be different for the spectrum of other lamps.
3: The reference level of light source test is at the top of the
spherical surface illuminated.
4: The optical detector should be exposed to light for 2
minutes before measurement.
5: Influence of tester's shadow and other factors on the
optical detector should be avoided.
Action principles
Concepts of illuminance scales
One lux (lumen) indicates the illuminance from a surface of
one square meter, all points of which are one meter from a
uniform source of one candela.
One foot-candle (Fc) indicates the illuminance from a
surface of one square foot, all points of which are one foot
from a uniform source of one candela.
Unit conversion for illuminance scales
1 Fc = 10.764 Lux
1 Lux = 0.09290 Fc
Conversion formula for illuminance and light intensity
E = I / r
2
Wherein E --- illumination value (Unit: Lux)；
I --- Light intensity of the light source（Unit: cd）；
r --- Distance from the luminous surface of light source to
the optical detector (Unit: m）.
During the measurement, the minimum distance between
the luminous surface of light source and the opto-sensor
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