Captahab
Unless the approach minima is specified as "circling minima", ie you are making an instrument approach to the airport, not a specified runway, the runways have to be designated as instrument runways. If the approach charts specify a runway to each RNAV procedure, it must be an instrument runway that you are making the approach to.
Check your AIP (Oz?) it will specify any Differences from ICAO Annex 14, and explain what has been used nationally. If no Difference is shown and no other references appear in the AIP to explain an apparent greater runway edge light spacing, I'd contact your regulator for an explanation.