Exterior LED lighting upgrade

Okay so I've been working on converting my interior and exterior lighting to LED and a thought popped into my head.

There are several lighting circuits around the car which have a dedicated fuse in the fuse box. The point of switching to LEDs is to significantly reduce the load on those circuits (with increased illumination). Now are those fuses there to protect the lamps or the wiring? (or something else entirely?) In other words, is it a good or bad idea to swap out the respective fuse for a smaller size to better match the expected load of the lighting circuit? Or am I overthinking things again?
Ok..if you did LED in your house would you put in lighter circuit breakers?
Nope.
As mentioned already, fuses are for protecting wiring.
The circuits will be much happier with the much lower load from the LED.
Cheers
 
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