To use additional SQ-646 devices, open additional SQ-646 software windows. The device serial number will
display in the lower left-hand corner of the corresponding software window. Devices may be selected by serial
number in the tool bar.
When the software is open and logging data from the
sensor, it will calculate daily light integral (DLI) in moles
and Dark Hours in hours each day at 12:00 AM using PFD
values collected during the previous 36 hours. The Dark
Hours value is calculated using
the “Darkness Threshold”
setting. The number of continuously logged PFD values
less than the Darkness Threshold are counted and
multiplied by the logging interval to calculate the number
of Dark Hours. This represents the longest continuous
duration of darkness, not the total duration of darkness.
