SUMMARY
Goniophotometric comparative measurements with a luminous flux integrator (constant
operational burning position) and a turning luminaire goniometer (burning position
changes during the measurement) may reveal, at most, minimal dependence on the
operating position for the light sources investigated. Nevertheless, an example for the
possibility of a position correction using the auxiliary photometer method in conformity
with CIE DIS 025:2014 was demonstrated. This allows measurements also to be carried
out in conformity with the standard using a turning luminaire goniometer which has a
compact footprint and is easy to operate. The auxiliary photometer method allows a
user who is not able to carry out such a complex investigation as in this study to verify
the applicability of the standard quickly and simply. A position correction can then be
carried out as appropriate.
While very fast measurements can be obtained for luminous flux and luminous intensity
distribution using a conventional goniophotometer, the spatial distribution of all
photometric and colorimetric parameters, e.g. color rendering index (CRI), can only be
taken using a goniospectroradiometer. Goniospectroradiometry is therefore an
indispensable tool for characterization of SSL light sources on an LED base.
SUMMARYGoniophotometric comparative measurements with a luminous flux integrator (constantoperational burning position) and a turning luminaire goniometer (burning positionchanges during the measurement) may reveal, at most, minimal dependence on theoperating position for the light sources investigated. Nevertheless, an example for thepossibility of a position correction using the auxiliary photometer method in conformitywith CIE DIS 025:2014 was demonstrated. This allows measurements also to be carriedout in conformity with the standard using a turning luminaire goniometer which has acompact footprint and is easy to operate. The auxiliary photometer method allows auser who is not able to carry out such a complex investigation as in this study to verifythe applicability of the standard quickly and simply. A position correction can then becarried out as appropriate.While very fast measurements can be obtained for luminous flux and luminous intensitydistribution using a conventional goniophotometer, the spatial distribution of allphotometric and colorimetric parameters, e.g. color rendering index (CRI), can only betaken using a goniospectroradiometer. Goniospectroradiometry is therefore anindispensable tool for characterization of SSL light sources on an LED base.
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