UV-C Lamps: When and How to Replace - UV Resources

The UV-C wavelength (253.7 nm) is invisible to the eye, the blue light that one sees represents only 5% of the total output of the lamps. So unlike the dark or flickering lamp above your desk or in the conference room, the visible light emitted from a UV-C lamp is NOT a good indicator of its performance. UV lamps will continue to emit the blue light long after the UV-C output has decreased, even by more than 50%!

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UV-C Lamps: When and How to Replace - UV Resources

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