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Could the wavelength and power of these bulbs be used to sterilize daily objects used in public transport like mobile phones/wallets?

Is there any guidance regarding duration of UVC radiation exposure and sterilization?

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There is a commercial product called Phone Soap (sold out now) that uses UV light to sterilize phones, keys, etc. you put the item inside it and I believe the UV light shines on it for 10 minutes which according to the manufacturer sterilizes it.

Yes and there is another commercial product that uses UV-C light to sterilize baby pacifiers:

https://www.amazon.com/Munchkin-Portable-Sterilizer-Viruses-...

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