For light treatment, this carbon electrode tip burns at high temperatures and emits isolated light. This allows you to obtain a visible overall light and radiant temperature of the continuous spectrum that resembles the suns rays required for treatment. Therapeutic carbon is the main ingredient of high-purity carbon (carbon), and therapeutic carbon is a core electrode with trace amounts of metal elements in the core, and the composition changes the issue spectrum. Source: Kazuaki Kuroda (1999) "Separate Edition, Visible General Light Therapy Theory and Examinations" Foundation Light Research Institute
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