Conclusion Several studies4s5 have reported the observation of the oneelectron reduced form of lumiflavin (FP-or FlH') by flash photolysis in aqueous solution in the absence of added electron donors. Hemmerich and co-workers suggested the formation of F1'-could be accounted for by eq 2. The failure to observe the Fl'+ radical was suggested to be due to either it absorbing at short wavelengths only or its rapid decay via hydrolysis. As we have ...