I had a caravan, I've tested the down lights that were in it, they were 10W QH @ 12VDC. each light chewed 0.9 AH, so 1 light for 5 hours = 4.5 AH.
I replaced all of them with LED down lights and now all 10 of them switched on use less than 1 AH. The van was lit up like "Crystal Palace".
LED lighting is the most efficient and lowest power consumption per Lumen you can get, most have a life cycle of 100,000 hours.
The big thing about them is you get what you pay for. The good quality LED lights will use less power than the cheapies, last longer and give a better quality light.
The new van I just bought has LEDs all round inside and out, except.... over the sink was a 8W fluro. I discovered on the Laanacoorie bash that it wasn't working so I bought a new tube, it still didn't work after replacing it, so I bought a LED light, half the length that puts out much more light and threw the fluro in the bin.
The LED works very well.
BTW LED spotlights will use more power, but for a camping light you don't need a spotty.