Tag: Bortle Scale

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Unihedron SQM-LU-DL

Unihedron SQM-LU-DL: The names Unihedron and Sky Quality Meter have become synonymous with measurement of sky brightness. Indeed, it’s hard to imagine a tool that has had greater impact on quantification of local light pollution. Unihedron’s original SQM set the standard and has since evolved into a comprehensive range of […]