An imperfect heat globe is retrieved from a pedestal during the quest The Temple at Senntisten.
It is a heat globe with a chunk of the pedestal still attached to it. The player must attach it to a broken pedestal, then roll it down a snowy hill and make it fall into a hole that leads underground, in order to solve the heat orb puzzle during the quest.
Looking at the globe itself, players will notice that a chunk of the pedestal it was on ripped off with it, thus it can't be used in other pedestals like the others, aside from the broken one. It also won't fit in the pipes under the temple because of this, but there is no use for doing that anyway.