NEC SpectraView Reference 241 User Manual page 64

Profiler
User Manual
ISO 3664 requires a luminance of 500 +/- 125 lux.
Other settings are also possible but then they are not standardized and
other users may not have the same exposure at their facilities.
Viewing boot for hardcopy comparison only
By using this setting the light booth will be automatically adjusted to a
luminance of 2000 lux. This is the standardized luminance to compare
artwork, photos and/or press prints to proofs.
This setting should not be used to compare (e.g. a proof) with the
display on the monitor.
other value/other value (emission)
To be not bound only to standard settings, it is possible to adjust the
lightbooths luminance to a custom value. The values can be entered in
the measuring units Lux (lx) or candela per square meter (cd/m ).
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