Regarding availability and LEDs: "All commercially available Far-UV 222nm lamps have excimer lamps at their core. Excimer lamps are a lighting technology that

Regarding availability and LEDs: "All commercially available Far-UV 222nm lamps have excimer lamps at their core. Excimer lamps are a lighting technology that excite a gas using high voltage electric discharges. Different gas mixtures generate different frequencies of light. Far-UV 222nm light is produced by excimer lamps filled with a mixture of krypton (Kr) and chloride (Cl) gas (normally less than 3% chloride)." From https://www.boeing.com/confident-travel/downloads/CAP-3_Disinfection_with_Far-UV.pdf https://www.boeing.com/confident-travel/downloads/CAP-3_Disi... provided in alliao's comment. I was able to find one 5W lamp priced at around $1000 and a 20W at $1700.