That is what I was thinking...and that our cameras recording normal IR are seeing that spectrum level reflected from objects in the most part, while in yours the light is generated through heat.

When I weld platinum, I use a gold #9 lens to protect my eyes from the white light which will easily burn the retina. I imagine a lot of IR is in that white appearing light, unseen.. Temp is close to 3200ºF.

Yes, the imaging techniques are different.