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1. How to power the light?

a. NP-F series battery. Such as NP-F970/NP-F750/NP-F55N.

b. V-mount/Gold mount battery via a D-tap cabel.

c.  Power bank or USB charger which can output 5V/ 2A. (ONLY OUTPUT 10W)

Notice: Batteries can't be charged by AL-F7.

2.Brightness can't be changed.

If you are using the USB power, it is normal.  The USB power only can supply a 5V*2A=10W power. But the max power of AL-F7 is 15W. So the brightness can't be changed when the brightness beyond 80%.

PS: Some USB charger or power bank only can output 1A or 500mA electricity.