The majority of the heat that is yielded by halogen bulbs is emitted forwards through the reflector.
Therefore, the beam is relatively warm.

However, the beam of an LED is almost cold. Therefore, the complete heat of the light-producing semiconductor has to be dissipated "backwards" through the printed circuit board / cooling surface.
In order not to destroy a high-power LED it should only be operated for a few seconds without adequate heat-dissipation / cooling.

These circumstances demand an increased constructive effort in order to ensure the necessary heat-dissipation / cooling.

An overload protection prevents excessive overheating of the high-power LED if cooled down badly, and lowers the power consumption.