I use this as a hallway safety light. As soon as the front door is opened, the sensor detects the door movement and the light comes on. It is easily bright enough (even in powersave mode) that I don't need to turn on the hallway light.
This was easily attached to the top of the door frame via one of the strips supplied. It actually comes with many ways to fix so can be easily moved between two locations if you wish.
Not blindingly bright but enough to light up a small room or shed, or enough to navigate larger rooms.
The power-save mode allows you to dim this further for prolonging battery life or for applications where the full brightness is not needed (wardrobes etc.)