An alternate intuition pump, at least if you're old enough to remember incandescent bulbs: consider how bright a 1000-watt bulb is, compared to how bright (in the visible spectrum) the 2-3000 watt oven element gets.
Look up the emission spectrum for a body at the temperature of a typical oven element: yes, it starts emitting some light that is visible, but the bulk of the energy is still in the IR band.
cwillu|13 days ago
cwillu|14 days ago