I like the magnetic backing for easy attachment to a metal surface, which means it is easy to detach for changing batteries. I attached one magnetically to the top of a metal screen door, and another also magnetically to the side of my cast iron bath.
I stuck one to the top wooden lintel of my front door with double-sided tape where I struggle to see the keyhole when it is dark. I will have to detach that when comes time to changing batteries.
The light is a cold white. I would have preferred a warm white but there was no choice.