User's Manual
C-5
Actiwatch-L and Actiware combine hardware and software functions to
determinelight(illuminance)exposureforsubjectsmonitoredwiththe
Actiwatch-L. Actiware will configure and retrieve data from an Actiwatch-L.
When light (illuminance) data are available, Actiware will display them in the
Actogram, Graph, Data List, and Statistics Table.
Actiwatch-L does not include a marker button. It is replaced with a light sensor.
Hence no marker data are available in the analysis windows for Actiwatch-L
devices.
ACTIWATCH-L
Parameter Value Condition or Unit
Peak spectral sensitivity 580 nm (nanometers)
Wavelength window 330 to 720 nm
Minimum illuminance sensitivity 0.1 lux
Maximum illuminance sensitivity 150,000 lux
Linearity 2% Typical from 0.1 to 150,000 lux
Uncertainty <10% Typical from 400 to 800 nm
Resolution 2% of lux value Typical
Temperature variation of spectral sensitivity <0.1% From 400 to 800 nm
Angular response ±50 degrees to 1/2 power point
Active area 5.16 mm2
Light Sensor Type
Actiwatch-L has a photodiode for sensing incoming light (illuminance). This
optical sensor has a spectral sensitivity approximating that of the human eye.
Light Sensor Performance
The light-measuring performance of the AW-L is as follows: