Use any led strip you have or want. :)

• Simple to print, 2 parts, 2 plates
• 240mm x 100mm. Big tray/desk light.
• Use it without lighting if you want, still looks great
• Curved middle to hold better the things.

Assembly:

• No special assembly needed, just arrange the led strips arround the  inside wall.

• There is a special ring inside to add the self adhesive led strip in order to light the ring around the tray. I did added more on the bottom also, because my led strip had very few leds/ meter (16), and I wanted a stronger light. You can play with different layout and see what works better for you.
• I suggest a simple usb light. I used the cheapest usb-bluetooth light found. 
  3$ on aliexpress and can be controlled with the phone. 
• There is a special groove to pass the usb cable inside, from the back of the tray. Inside the case there is also a special feature to hold the usb cable in order to not be able to pull the strip accidentally.