If you still think you can blast the virus out of your lungs with light: you may not die of cancer doing it!

But you need the input of ~79 tera (a number with 12 zeroes) suns to make it shine at 10 cm depth in a lung, which will very likely make this your last sun bath...

An attenuation coefficient for the lung of 3.2cm^-1 was assumed.

https://iopscience.iop.org/article/10.1088/0031-9155/42/11/018

For simplicity, it is just shown how much input is needed to get the equivalent of one terrestrial solar flux at 10cm depth.

This was for 632nm (red), UV gets even more absorbed...

Note that this is a conservative estimate, as the attenuation coefficient is for red light. It will be higher for UV (higher attenuation coeff. means less penetration of the light).

This publication lists even higher coefficients for lung @ 630nm: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3321368/

Ordinate should go to 7.9*10^13, not only 7.9*10^12. Sorry, I run out of sun symbols to stack up.