PL works with Xenon lamps that can produce intense and short time pulses of
broad spectrum “white light” (ultraviolet to the near infrared region).
The UV-C part of the spectrum (200 to 280 nm) is the most important
for microbial inactivation. Inactivation depends on the intensity (measured
in J cm−2) and numbers of pulsed delivered, and occurs by several
mechanisms including chemical modification and cleavage of
DNA, protein denaturation and other cellular materials alteration