Furthermore, while photoredox catalysts generate potent redox agents while exposed to light, they are innocuous under ordinary conditions Thus transition-metal complex photoredox catalysts are in some ways more attractive than stoichiometric redox agents such as quinones.
Furthermore, while photoredox catalysts are potent redox agents while directly exposed to light, they are also very stable to ambient conditions and do not change oxidation state. This can make transition-metal complex photoredox catalysts much easier to work with than stoichiometric redox agents such as quinones.