SQM-LU Detection Cutoff Angle

[MgcJim]

With the SQM pointed vertically, is there an effective zenith angle cutoff for measurements?  I suspect it does not measure light at a zenith angle of 90 deg.  Perhaps there is a "detection drop off" function?  My concern is the location I want to mount the meter in is not taller than the observatory that is closeby.

thanks
Jim

[admin]

The following plot shows the response of the meters at various angles.

[MgcJim]

Excellent.  That's exactly what I was looking for.