UV light has been used to kill mold in numerous industries because it is safe, cheap, and effective. See my guide on how UV light kills mold
Do UV Lights In HVAC Systems Actually Kill Mold?
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Does Ultraviolet Light Kill Mold – PhoneSoap
Frontiers Ultraviolet Radiation From a Plant Perspective: The Plant-Microorganism Context
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Does UV Light Kill Mold?
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COOSPIDER UV Light Bulb, 36 Watts UV Light Sanitizer for Basement/Storehouse/Car, UVC Germicidal Lamp for Sterilization, Odor and Mold Removal, E26 110V CTUV-36 (with Ozone)