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GENERAL LIGHTING MEASUREMENT
Total luminous
flux is the spatially integrated, photopically weighted, total light
output from a lamp. Total luminous flux is the most important
parameter for non-directional, general lighting products.
For directional lamps, such as reflector lamps,
intensity and
beam angle
are the most important parameters. The lamp total luminous flux
divided by the lamp electrical power is the luminous efficacy (lm/W)
of a lamp.
The most common method for measuring the total luminous flux
of lamps is using an integrating sphere photometer employing V
(lambda) corrected photometer or spectrometer. The reading from the
detection system is compared to a similar reading obtained from a
calibrated standard lamp of known output, commonly referred to as
the “comparison method”. The results of this comparison determine
the light output of the test lamp.
Typical quantities of interest are
luminous flux,
luminous efficacy,
chromaticity,
color temperature
and
CRI.
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