Lights come equipped with a mounting device and this is meant to create a solid attachment to the handlebars or helmet for your front light and to the seat post for your back light.
When choosing a commuter light, it is essential that you choose one with an easy mounting system, A tool free mount will be easy to install and will also mean that it Is super easy to transfer your lights onto another bike if needed.
You should also consider how easy it is to pop the lights on and off your bike. Leaving lights on your bike while it is locked up outside is an open invitation to thieves, they’ll be gone before you blink.