1 halogen bulb takes 1.2 Amps, 1 LED takes about 0.2 Amp, which is quite dramatic difference.
Not sure it's that high with the halogen bulbs - each bulb is 5 watts, therefore the current each bulb consumes is 5/12 amps, or .417 amps, therefore all 5 fitted in the Cali will consume a total of 2.08 amps.
I have changed my bulbs for 22mm diameter 7-element LEDs (anything larger will not fit the holder)
Of the 5 G4 5 watt halogens, I changed the 2 either side of the sliding door, and the 2 over the hob/fridge area for blue LEDs, and the one in the rear for a warm white LED. I found it easier to take the whole fitting out of the trim panel, disconnect it from the wiring, pop the opaque cover off and change the bulb. Very easy to do.