That's a good point regarding brumation. The Australian species like Northern brumate. Meraukes and IJs from more tropical climates require higher humidity and do not brumate.
They don't require a lamp for basking, just a hot spot. A heat pad will work for this.
And just a side note - Northerns are all CBB. Most Meraukes, IJ and other non-Australian species are typically wild caught and should be taken to the vet to ensure they're free from parasites.
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