Can someone help me troubleshoot my little problem?
I decided to craft myself a little lightbox seeing how good they are for miniatures shooting!

Now, the outcome isn't as pleasing as I wouldve imagined. The overall lighting isnt optimal and there this weird green stripping (banding?) in the pictures.
(The miniature is covered in glossy varnish! Thats why its shiny)
Here are two pictures of a miniature.

I'd be so happy if someone could help me with this, since i've heard such good things about those light box and would love to use mine to full potential!
I take my pictures with a Samsung S4 camera, and the "Zoom FX" app. I know the app itself is not the problem since I triedl 3 camera apps and they all had it (And the last picture dosen't have them!)
It is not the camera lens being dirty either, since i made sure it was thoroughly clean between each pictures.
The banding also appears on screen in real-time. wont go away unless i pull away from the light.

My guesses is; Using a fluorescent could lightbulb causes this?

Things I cannot change; F-stop, shutter speed.
Things i've tried to no avail; Iso. white balance.
Any input or advice would be gladly appreciated!
Thanks