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We've (those in SA) now got an IDA approved International Dark Sky Reserve just two hours from Adelaide. Sky measurements were done with professional grade sky measurements by DSTG personnel. SQM's were initally used by the IDA said the 22.0+ measurements were not recognised, so some specialised techniques were used to measure the sky. Measurements ranging from 21.9 to 22.06 (Although the IDA says above 22 is not possible, I know it is myself). So those skies are considered to be Bortle 1. Certainly we have seen the bridge with our own eyes in the pristine conditions out there. For more information take a look for the River Murray International Dark Sky Reserve (the word International has only been added this week with the IDA gold standard approval).
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