In the flow-through reactor, the emissions at combined wavelengths resulted in lower k3 values than the emissions at a single wavelength. Namely, combined emissions were less efficient than each component emission illuminated separately in the fluence-based analysis, as was observed in the time-based evaluation. The k3 at 265/280 nm was significantly lower than that at 265 nm (p < 0.001), though the difference in k3 values between 265/280 nm and 280 nm was statistically insignificant (p > 0.05).