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.