Jinbei EF-150Bi, Руководство пользователя

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The measurement of unconcentrated light is standard without ref-
lectors, the linear distance from the LED continuous 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 con-
trast thus becomes greater and the light at the corresponding centre
of the measurement is dimmed. The illuminance increases.
Illuminance Measurement
1 meter
unfocused light
1 meter
reflector