Hey Merowin,
Welcome to CPF, and why dontcha stay awhile!
The 24/7 is a great all around light, especially in the car. I think it's a bit more hi-tech than you need in a tent. I use a CMG Ultra on a short lanyard hung from the middle of the tent. Inexpensive, bullet- and fool-proof, great runtime and uses easy to find, cheap batteries.
cy's choice of an Arc AAA is great, too, but Arcs are hard to find and pricey these days. For more diffuse light, you can use one of WitsEnd's battery powered lightsticks, they run on three v76 batteries.
CMG also makes the Bonfire Blaze, which is intended to be used as a tent light, but for thirty bucks, you could have an Infinity Ultra with cash for a whole bunch of batteries! Note that since Gerber took over CMG, there have been complaints on the new Infinity Ultra, but YMMV.
And check out these previous camping threads (found using the search function):
camping thread1
camping thread2
camping thread3
camping thread4
And there are more going back further.
Welcome again!
daloosh