Your numbers
Convert from
SQM reading (mag/arcsec²)
Naked-eye limiting magnitude
Bortle class
SQM reading (mag/arcsec²)
Dark skies read about 21 to 22; a bright suburb reads 18 or below.
Naked-eye limiting magnitude
The faintest star you can just see, from 3.0 to 7.9.
Bortle class
Class 1
Class 2
Class 3
Class 4
Class 4.5
Class 5
Class 6
Class 7
Class 8
Class 9
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