Laskern, the obligation is fulfilled by saying Hallel. There is no Torah need to light candles. Regarding safeka d’yoma there is a problem, maybe even bigger than that occurs on the eighth day of Sukkot in Chutz laAretz regarding sitting in the Sukka. One who says Hallel every day blasphemes. Therefore if the “ninth day” is not part of Chanuka (and now that we have a fixed calendar we know that it is not), then it is prohibited to say Hallel.
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