I'm not familiar with the transmutation to light or sending to other worlds vocabulary, but what I can say, during my meditations trances I received healing, sometimes I felt my body heating a lot, burning the bad things away, and sometimes they were evacuated via the regular digestion process.
For intestinal parasites (which I guess are the most common), I don't think sending them to the underworld is a problem. But for other problems within the body (like lung infections), the transmutation / burning is necessary.
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