Poznámky redaktora
theory, talk about
1 MacAdam soon there visual differ-
ence with respect colour percep
tion.
These correspond finely differentiated
para
meters which are divided into so-called
bins.
MacAdam ellipses describe the colour
distan
ces the coordinates the stand-
ardised colour table. Thus, illuminated
surfaces and light emitting panels lumi-
naires are given uniform appearance. The colour difference between
wide-angle luminaires with high luminous flux
levels (replacing fluorescent lamps) consid-
ered excellent MacAdam ellipses. Depending the application and the
product, these features are weighted
differently.
In practice, MacAdam ellipses are often
used give users idea how far individ-
ual LED modules differ with respect colour
perception.
A colour difference between individual
LED modules one luminaire and between
individual LEDs, i. This
selection especial
ly important when it
comes “single LED” products and applica-
tions with maximum white light quality such
as museums.
By using specific binning groups, colour
and brightness tolerances not just the
light emitted individual luminaires, but
also visible luminous surfaces are
reduced minimum.
The properties each individual LED are
measured after manufacturing and allocated
to group showing the same features.75
The Lighting Handbook
White light quality and binning
In the production LED chips, LEDs of
diffe
rent production batches have different
properties with respect intensity, colour
temperature, colour location, with respect
to forward voltage.
MacAdam ellipses along the Planck curve for white light
6500 K
5700 K
5000 K
4500 K
4000 K
3500 K
3000 K
2700. individual luminaires in
case spotlights, MacAdam ellipses at
present considered the maximum technical
feasibility.e
