In the world of lighting, all the
terms sound similar but actually they have a different meaning. This can lead
to many confusion and overall misunderstanding of lighting terminology. The
widely used lighting terms that usually mixed up with each other and create
confusion are luminance and illuminance. So, what is the difference between
these two words?
Luminance
Luminance describes the measurement
of the amount of light which emits, passes or reflects from a particular
surface from a solid angle. It also explains that how much luminous can be
observed by the human eye. This clearly describes the brightness of light which
is emitted or reflected from a surface. In the color measurement laboratories,
luminance is used to measure the brightness of the displays. There are numerous
units that are used for explaining the luminance. The SI unit of luminance is candela/square
meter or cd/m2. The luminance can be quantified easily using colorimeters,
spectrophotometers, etc.
Illuminance
It is the amount of light that
falls or spreads on the particular area. Illuminance explains that how the
human being observes the brightness of an illuminated surface of the sample. That
is why users use term illuminance or light which creates confusion as
brightness also describes the luminance. To explain the difference between the two, illuminance refers
to the particular kind of light measurement whereas the brightness is the
psychological sensation of light. The SI unit of illuminance is lux. This can
be measured with the color measuring cabinets.
Testronix offers a broad range of color measurement devices
such as colorimeters,
color viewing booths, spectrophotometers and many more. For more information on
these devices, visit: www.testronixinstruments.com/
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