Bright, but relatively speaking, perhaps a bit of an energy hog.
This Utilitech brand LED lantern is presently a closeout special available at many Lowe's stores.
With a posted top output of 300 lumens, and powered by three D Cells (not included), its packaging states it only has a 20 hour run time on high setting, while boasting "more than 30 hours" operation on low.
Still, for someone wanting a budget LED lantern, especially for someone using rechargeable batteries, it looked like a decent buy at under $7 at my local Lowe's. So I grabbed one.