[Terr_]

> Heat vision. [...] MWIR is neither heat, nor is it light. It’s both

No, it isn't. The "infrared light is heat" statement is casually-useful but technically-false, which means it backfires and harms people when they start learning more about physics.

IR radiation is not the intrinsic heat-content of the matter emitting it. Infrared is simply a particular set of wavelengths which happens to be prominent for temperatures which are "hot" for us just because we evolved on this small rocky planet which has a certain baseline temperature.

Go ask some icy crystalline aliens or ones powered by low-grade nuclear reactions what they think about "heat radiation" and you won't get the same answer.