Efficacy of Three Light Technologies for Reducing Microbial Populations in Liquid Suspensions

Table 1

Calculated exposure time (sec) of nonthermal light technologies at selected distances from the light source.

			Dose per treatment (J/cm^2)
			0.18	0.36	0.72	1.44	2.832	6	17.7	27	36	54	106.2
Distance from light source (cm)	3	NUV-VIS	6	11	22	45	88	186	548	836	1115	*	*
	12		28	55	110	221	435	*	*	*	*	*	*
	23		149	298	595	1190	2341	*	*	*	*	*	*
	6.5	UV	30	60	120	240	472	*	*	*	*	*	*
	17		36	72	144	288	566	*	*	*	*	*	*
	28.5		45	90	180	360	708	*	*	*	*	*	*
	2.5	HILP	NT	NT	NT	NT	0.8	NT	5	NT	NT	NT	30
	8		0.1	0.2	0.4	0.8	NT	NT	NT	NT	NT	30	NT
	11.5		NT	0.3	0.6	NT	NT	5	NT	NT	30	NT	NT
	14		0.2	0.4	0.8	NT	NT	NT	NT	30	NT	NT	NT

NUV-Vis: near UV-vis light; UV: ultraviolet light; HILP: high-intensity light pulses.
(*) Samples that are not analyzed due to high temperature, NT: not tested samples.
Distance from light source (cm).
HILP was applied in pulses 360 𝜇s duration at a frequency of 3 Hz.