23
Illuminance Measurement
The measurement of unconcentrated light is standard without reflec-
tors, the linear distance from the LED light source to the illuminance
meter is 1 meter.
When the angle of incidence of the reflector becomes smaller and
its depth deeper, the light is bundled. The centre of the light is very
bright, the surrounding glow appears dimmed. The light ratio contrast
thus becomes greater and the light at the corresponding centre of the
measurement is dimmed. The illuminance increases.
1 meter
unfocused light
1 meter
reflector
