There has been quite a bit of discussion using LED's to save power when boondocking. This might a partial solution for some. Have never seen this mentioned before so I pass the info along for what it is worth. I have no connection with this company and have never used their products. I understand that 2009 model Casita trailers will come equipped with these.
Those look like they should do the trick.
We recently ordered a set that are about the size of the factory installed puck lights. We found them in a Sprotys Tool Shop catalog and they use three AAA batteries, are directional with a touch of the finger and they seem to throw out good light. We're going to try them for reading and to see what the life of the batteries will be. They certainly won't throw off heat.
I've installed a couple of LED next to the stock lights over the kitchen counter and the dinette. They are great for boondocking and letting me see while I make my breakfast and Sam sleeps. I plan on adding one in the bathroom too. I got them at West Marine.
Unfortunately the info in the above link doesn't say whether the light is warm or cool white. I tried downloading the "Heavy Duty" catelog and their is no mention of the shade of white. If this is important to you, you may want to contact the company directly for more info.