Pulsed UV light was found to be a more effective and rapid way of inactivating microorganisms due to the instantaneous delivery of more intense energy than continuous UV light, for the same total energy supplied. A greater inactivation of Escherichia coli
by PL was reported by Bohrerova et al. (2008), who found that pulsed UV irradiation was approximately 2.4 times more effective than equivalent levels of UV irradiation produced by a continuous medium-pressure system.