User's Manual

C-7
Illuminance data are displayed in the Actogram as an orange line graph
superimposed over the activity data. You can use the Actogram View toolbar to
adjusttheIlluminance Scale, the vertical height of the illuminance data.
Illuminance data are also shown in Graph as an orange line.
Per epoch Illuminance data can be seen in the Data List along with activity data,
and can be exported along with activity data and per epoch sleep analysis results.
The Illuminance column can be shown or hidden in the Data List or Export files
byadjustingsettingsintheTools > Options > Data List window.
To select illuminance statistics, use Tools > Options window, Statistics tab.
The selected illuminance statistics will be included for Rest, Active, Daily, and
Custom Intervals. This will cause these statistics to be included for Rest, Active,
Daily,andCustomIntervals.YoucancreateCustomIntervalsforanalyzing
periods of interest, without using or affecting sleep statistics. See Advanced
Usage, section 4 for help in creating intervals.
Definitions for Actiwatch-L
ThefollowingdefinitionsarespecificwhenanalyzingdatafromanActiwatch-L.
Illuminance
Intensity of illumination. The luminous flux incident on a given surface per unit
area. Measured in lux.
Luminous Flux
Rate of flow of radiant energy as evaluated by the luminous sensation that it
produces. The luminous flux is obtained from the radiant flux of the source
corrected according to the effect it has on the observer, i.e. according to the
spectral sensitivity of the receptor.
Lux
SI (System International) unit of illuminance. One lumen uniformly incident on
an area of one square meter.
Light
The agent that causes a visual sensation when it falls on the retina of the eye (a
narrow section of the electromagnetic spectrum).