A special cable that transforms the 5V from a USB outlet to the 24V the lamp needs. With this cable you can power your lamp through a power bank! This cable is for a low stand. Do you want to play standing, choose 'step-up cable 130cm' 

We guarantee this cable works fine with the power banks we supply.

If you want to use your own: there are power banks on the market where the overcurrent protection is so tightly set that it doesn’t work with this cable. However most power banks will do just fine. Unfortunately we cannot give a list of the troublesome brands, there are just too many on the market!