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@Emyr
Halogen bulbs give most their heat out of the front with the light unless it's a dichroic lens package. LEDs produce less heat per lumen but it's generated in the tiny junctionof the diode and needs conducting away to heat sinks. This is why decent bike lights have ribbed metal bodies and led replacements for standard bulbs have a lot of ugly metal below the fitting.
If your halogen spot fitting doesn't have enough ventilation behind the units your LEDs won't last their advertised life.