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Looks like both.

Hello vlaiv Would it be more likely to be UV as this is the more powerful wavelength.

Thanks Olly. I have informed Sam at ZWO, as the poor man has had to put up with my questions about the 174 Amp Glow. I have just become the proud owner of a 1600 MM pro, and that has had the same cover (different foil) It appears to me that just using the plastic cover does not prevent light leaks completely, and this maybe why people struggle with Amp Glow removal.

Hello Mickey I have an ASI174MM cool, I was unable to remove the Amp Glow, I discovered that covering the sensor with the supplied plastic cap, and then, covering the sensor end of the camera up to the vent fins with four layers of Aluminium kitchen foil, held in place with an elastic band. The amp glow calibrates out with the darks produced.