Sound can be used as an analogy.
Imagine a piccolo being played in its upper registers, with lots of birdsong and bats squeaking; this will be my analogy for light. The high frequency sounds are at a range of frequencies, just as light is in a range of colours.
Now imagine an army of monsters wearing lead-soled boots doing a jig on a steel bridge. Laughing yet?
The monsters make lots of bass noise; this is my analogy for heat.
The ceramic heater makes the same difference to the exact frequency of the heat radiation that replacing the monsters with WWII tanks would make to the noise.