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lm
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3 definitions • 2 examples
1
a
unit
for
measuring
the
amount
of
light
something
produces
:
Examples:
a
light
bulb
rated
at 750 lumens
2
the inside
space
of a tube-shaped
organ
in the
body
, for
example
a
blood
vessel
or intestine:
Examples:
intestinal
/
vascular
lumen
3
the
standard
unit
for
measuring
the
brightness
of a
light
,
equal
to the
amount
of
light
hitting
one
square
foot
of
surface
one
foot
away from the
light
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