The lighting on the circle case is fake, it is just a piece of clear plastic reflecting the LCD.
The LCD animate a ring around the clock when you close the cover. I haven't find any app to change the lighting yet, I hope one will come out soon.
As a side note to anyone wanting to get one.
If you get a Glass protector, I couldn't get the cover to magnetically close, it seems the extra mm from the glass is preventing this.
Anyone got a plastic screen protector, can you confirm the cover can magnetically close?