This light is bordering on too good to be true.
It is surprisingly bright. Put it this way, we had it in our tent with a full-size camping lamp - this tiny light lit up more of the tent, and was brighter, than the camping lamp.
The first time I turned it on, I looked straight at the LEDs as I thought the light would be wimpy - it actually hurt my eyes.
One of these lights up and entire room in our family tent - it is good at short-range, bright illumination. Perfect for inside a tent.
One incidental but great feature is that the hook fits into that little hole in the zip tab (that you pull to open & close the zip) on the door of a tent bedroom (well, it fits ours and I assume that they are all a standard size. If it doesn't fit yours, you could just put some string through the hole and make a loop). Firstly, this means no more waking in the night and wondering where the torch is. Secondly, you have an adjustable reading lamp (move zip to adjust position). Thirdly, you have a massive tab to open and close the zip.
Using the hook, the lamp shines at a 90 degree angle to the vertical (hence why it can be used to read a book). The hook is attached to the lamp by a ball-and-socket joint - as a result the light beam can be pointed in any direction (i.e. if hanging it from the ceiling of a tent, you could point it at any of the 4 walls or anywhere in-between).
The hook folds into a recessed area in the rear of the light. To get it out, just flick the light (I couldn't lever the hook out with my finger). The hook then pops out enough to pull out fully with your finger.
These lights are sold under a variety of names (IOSSS, Rolson, Uni-Com) but all appear to be identical, save the Uni-Com one which has the bonus of a second hook (allowing the light to point at 180 degrees to the vertical, i.e. straight down, in addition to 90 degrees).
Having bought one of these lights for a camping trip, I bought more - one for each bedroom of our tent & the lounge.
Since returning from camping, we use this to double up as a reading light on our bed when needed (it is made from steel, so the magnet sticks to the headboard).