No. UV-A waves are only perceptible to the human eye from 400nm (nanometers) only. The UV-A LEDs in the AiroDoctor operate at a wavelength of 385nm. During photocatalysis, the titanium dioxide (TiO2) completely absorbs the UV-A radiation from the LEDs. However, the radiation stimulates fluorescent materials to glow, which the human eye perceives as purple. The purple portion is a fraction of the emitted light, so to speak, the fringe of the wavelength used, but not UV-A radiation.

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