Table 1. UV-C dose for COVID-19.
| Type | Wavelength (nm) | UV-C Dose (mJ/cm2) | Reference |
| Hg lamp | 253.7 | 3.7 | Bianco et al. (2020) [24]a |
| UV-C LED | 280 | 37.5 | Inagaki et al. (2020) [19] |
a
In addition, Biasin et al. [25] reported that a UV-C dose of 3.7 mJ/cm2 was sufficient to achieve a more than 3 log10 inactivation (99.9%) of the virus at a viral density comparable to that observed in SARS-CoV-2 infection. Also, in a review and analysis of coronavirus photoinactivation studies, Heßling and Vatter [26] reported “the available data [set] reveals large variations, which are apparently not caused by the coronaviruses but by the experimental conditions selected. If these are excluded as far as possible, it appears that coronaviruses are very UV sensitive. The upper limit determined for the log-reduction dose (90% reduction) is approximately 10.6 mJ/cm2 (median), while the true value is probably only 3.7 mJ/cm2 (median).”