Coleman lanterns are best used outside, especially in the summer because they put out a LOT of heat.
To me, the amount of light they put out is also overwhelming inside my van. I prefer either dimmable LED lanterns, or my old fashioned kerosene wick lantern. If I am just lounging around, I prefer the kerosene lantern for the warm soft light of the flame. It can also be turned up to provide quite a lot of light if needed. It can also keep the chill off on a chilly evening.
If I'm actually working on a project, I prefer the LED lanterns because they can provide a LOT of light. Also, I prefer them for beside my bed, because the quick turn of a dial provides light without the need to actually light it. Since mine are of the dimmable variety, they can provide a very wide range of lighting from just enough to see your surroundings to a bright area light.
I like the lanterns that are totally self contained and portable, so I can take them to where I want the light, either inside or outside. Mine have multiple charging sources including their own solar panel, a hand crank, AAA batteries, and both 12v & shore power charging cords. They also have a USB charging port on them to charge your electronics. One of mine also has a built in AM/FM/NOAA weather radio built into it that I use ALL the time, since I enjoy the background music, news, etc. If I'm in my van, the odds are that radio is playing softly, sometimes even when I'm sleeping.
If I need it to be absolutely daylight in my van, I have two 48 LED UFO lights mounted with velcro to my ceiling, one towards the front, one towards the rear. They use AAA batteries, and considering that I use them so rarely, the batteries will last for several years.
The kerosene lanterns are about $5 at Walmart, the LED lanterns are about $15 on Ebay, and the UFO lights are about $5 on either Ebay or at Walmart. With the exception of my headlamp, this collection provides all the light I need for any given situation.