I already have LED lighting inside the van, and while it's nice and bright, I didn't have a reading lamp. I also didn't have any lighting for the outside of the van...
BUT I got a Ticla Good Love lantern as a present! This solved both issues (interior reading lamp and exterior lighting) with one little device.
(Disclaimer: this is a stock image and it's not me modeling the light

)
http://www.mec.ca/product/5041-488/ticla-good-love-lantern/
There's a few things in particular I like about this lantern:
-the color of the light output is nice and warm
-it's dimmable (low light for reading inside, max power when playing cards outside)
-it can run off its internal battery pack
-it can run when plugged in via USB (I have many USB ports in my van so this was a nice addition)
-it can run off of 4-AA batteries
-it will CHARGE the internal battery AND the AA's when plugged into USB
It's a decent size and has a good range of light output. Time will tell about the durability but it feels quite well built so far.