Very simple clips for holding an inexpensive LED light bar above your MK4 print bed. The clips attach to the top rail of the printer frame. I have included the f3d file in case you want to use a light with different dimensions, or need to adjust the dimensions. 

Obviously, you need to print two. I recommend putting the light bar on the back side of the frame so it does not interfere with the filament feed. That said, it should work on the front if you want to try it that way.

I modeled this to hold the DWEPTU LED bar i found on Amazon (US). I expect this bar is relabeled under many many different brands.