Hello Paul,
Sorry for the delay in replying to your last response.
In general LEDs use far less current than conventional bulbs for the same light output power.Assuming the LEDs you have fitted are lower wattage than the bulbs they replace then yes you will be able to use the bulbs for longer for no extra power consummed.
If you are interested,
Direct currnet (DC) electrics fortunately have a simple interelationship between Volts (V), Amps (A) and Watts (W).
V x A = W,
For most 12V devices this relationship yeilds accurate results:-
Batteries are quoted as having a capacity of so many Amp/hours (Ah), and in simple terms it means that a 110Ah could provide a current of 1A for 110Hours, or 2A for 55h and so on, though taken they als usually have a maximum discharge rate which
means you can't take it other extreme i.e 110A for 1 hour!
Most conventional caravan lights(filament and flourescent) consume between 1 and 1.5A of curent when operating. As we tend to use lights for extended periods (several hours) then its quite suprising how much they drain a battery, so any more efficent lighting could make a substantial power saving.