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BYK-Gardner GmbH
Programming a Sequence
Press and hold the yellow SEQ button (A). While holding the SEQ button, press the but-
tons for the sources you wish to turn on in the order you want them activated (up to 10).
After selecting your light sources, while still holding the SEQ button, press the OFF (G) but-
ton for the length of time you want each source to be on.
(NOTE: All sources will be turned on for the same time period - if you want an individual
light source to be on 2 or 3 times longer, simply press its button two or three times while
programming the sequence. The sequencing "On" period has been programmed to not al-
low "On" times to be less than 5 seconds.)
After releasing the OFF button, you can release the SEQ button. The SEQ button will stay
illuminated. To use the automatic sequence simply press the illuminated yellow SEQ but-
ton. The sequence will remain in memory until a new program is entered, or, if you press
the SEQ button and hold while pressing the OFF button, this will also clear the sequence.
You can use the selection buttons to operate the unit normally even though a sequence is
stored.
Detecting "Metamerism"
When two color samples match under one light source, but not under one or more other
light sources, the "color-match" is metameric. This means that the colorant formulation in
one sample differs from the formulation in the other, resulting in differing spectral reflect-
ance factor curve shapes. A metameric color match can also be referred to as a "condi-
tional" color match, since the quality of the color match is conditional to the type of light
source under which it is viewed.
While it may not be possible, with the colorants available to completely eliminate meta-
merism, the byko-spectra provides colorists with the means of visually "indexing" the de-
grees of metamerism under three spectrally dissimilar light sources. The formulation may
then be adjusted to provide the "best match" under a specified lighting condition, or the
least metameric match under all three lighting conditions.
For obtaining the best correlation with instrumental measurements, calculated color dif-
ferences and metameric indices, the spectral power distribution of the sources in the booth
should be used in the computations.
184 020 846 EDFS 2402
byko-spectra standard
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