Lumen
Lumen is a term used to describe the measurement of light conversion. One lumen equals one candela across one Ste-radian and is a measure of luminous flux, adjusted to the human eye’s perception of the light’s power.
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Lumen illustration
LUMEN ILLUSTRATION
Lustre
Lustre is a term used to describe fabric or fibre the ability to reflect light. The quality and nature of the reflection may be a useful diagnostic aid.
Lustre diagram
LUSTRE DIAGRAM
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