Abstract: A device for generating ultraviolet (UV) radiation whose wavelength is optimally tuned into the range of 250 to 285 nm, with peak wavelength in the range of 260 to 270 nm, which attains a Peak Germicidal Disinfection Effectiveness Index of nearly 100%, superior to conventional UV lights and lamps. The device comprises an ultraviolet light-emitting diode (LED) array, an operation control system, an airflow sensor with programmable sensitivity, and a surge protection module. The device is installed in conventional HVAC systems such as air conditioning systems and HVAC ducts to effectively disinfect airflow passing through to deactivate bacteria, viruses, and mold. Depending on the operating status of the HVAC systems, the device senses airflow passing through or going around and intelligently turns on and off the ultraviolet LED array to attain a longer lifetime.

Abstract: The present invention provides an air purifier that purifies, disinfect and decontaminate convention air flow by using UV rays. Because the UV rays emitted by the UV light sources are contained within the air purifier, use of the air purifier is safe in that a nearby person can avoid exposure to hazardous UV radiation. Adjustment of operating conditions, such as the UV intensity and wavelength and air speed, is programmable via a remote controller, a smart switch, a smart device, a wireless communication device, a smart home control appliance, a sensing device, and/or a built-in module, which renders the air purifier a smart appliance that may automatically and optimally suits to a user's need based on the user's habit and other physical parameters. Installation and removal of the air purifier, as well as cleaning and replacement of any part thereof, are simple and convenient, as a result of the clever design.

Abstract: The present invention provides a device for generating ultraviolet (UV) radiation whose wavelength is optimally tuned into the range of 240 to 290 nm, with peak wavelength in the range of 260 to 270 nm, which attains a Peak Germicidal Disinfection Effective Index of nearly 100%, superior to conventional UV lights and lamps. This device comprises a light-emitting diode (LED) matrix, a fan, an LED driver, a base and a motion sensor with programmable sensitivity and time delay. It may further comprise components for thermal protection and active air circulation. When operating, the device emits visible UVA radiation and blue light. With special considerations for user safety, the device effectively protects users from exposure to UV hazards and is safe to use. With the built-in thermal protection, this device may be used with either open or enclosed fixtures.