Thus, an optimal f-EPC reactor should feature at least one transparent electrode to ensure effective light penetration. Lastly, the reactor's volume should be adaptable to modulate productivity, such as by altering the inter-electrode gap using gaskets. Capitalizing on our experience (8c, 14), we present herein the development of such reactor to perform an efficient electrophotocatalytic heteroarylation of C(sp 3 )-H bonds. The achievement of this transformation was realized through the combination of hydrogen atom transfer (HAT) via LMCT photocatalysis and an electrochemical oxidation.