Poznámky redaktora
Depending the application and the
product, these features are weighted
differently.
The properties each individual LED are
measured after manufacturing and allocated
to group showing the same features.e.
These correspond finely differentiated
para
meters which are divided into so-called
bins. The colour difference between
wide-angle luminaires with high luminous flux
levels (replacing fluorescent lamps) consid-
ered excellent MacAdam ellipses.
MacAdam ellipses describe the colour
distan
ces the coordinates the stand-
ardised colour table. theory, talk about
1 MacAdam soon there visual differ-
ence with respect colour percep
tion.
In practice, MacAdam ellipses are often
used give users idea how far individ-
ual LED modules differ with respect colour
perception.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. 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. Thus, illuminated
surfaces and light emitting panels lumi-
naires are given uniform appearance. individual luminaires in
case spotlights, MacAdam ellipses at
present considered the maximum technical
feasibility.
A colour difference between individual
LED modules one luminaire and between
individual LEDs, i.
MacAdam ellipses along the Planck curve for white light
6500 K
5700 K
5000 K
4500 K
4000 K
3500 K
3000 K
2700
