Originally Posted by Numbercruncher
So traditional halogen filament type of bulbs get hot on the surface which is what most of us think of when we reference head lamp getting warm. But LED's for whatever reason are cool on the surface but generate heat on the back end? What causes this? LED's draw so little current I can't fathom where the heat could possibly come from?
LEDs are cool to the touch because they generally don't produce heat in the form of infrared (IR) radiation.
The junction temp of an LED (light emitting diode) can reach 185 deg C in order to provide high lumen output. The diode has to have a heatsink to prevent overheating.
All this heat does nothing for the light surface area so in cold climates ice buildup can be a problem. Some LED manufactures heat the surface lens to prevent ice, the majority do not.
What Jeep does is unknown at this point to me.