Bactericidal Effects of 405 nm Light Exposure Demonstrated by Inactivation of Escherichia, Salmonella, Shigella, Listeria, and Mycobacterium Species in Liquid Suspensions and on Exposed Surfaces

Table 1

The effect of applying a dose of 108 J cm^–2 using three different power density/exposure time regimes on the 405 nm light inactivation of L. monocytogenes in suspension.

Power density (mW cm^–2)	Exposure time (min)	Dose (J cm^–2)	Log10 CFU mL^–1 reduction
10	180	108	5.18* (SD ±0.2)
20	90	108	5.05* (SD ±0.0)
30	60	108	4.90* (SD ±0.4)

*Indicates where a light-exposed bacterial count was significantly different from the non-exposed control count (𝑃≤0.05 calculated at the 95% confidence interval).
SD: standard deviation of averaged results.