This is a LED Lightning which I designed.

Provided are the connector pieces to be used in conjunction with generic cable channels (in this case 15x15mm). I printed them in white, but printing them in a translucent material may leave you with a nicer end result in terms of the glow effect.

They should just slide right into the connector pieces and are held on with a glue of your choice.

LED strips can be laid inside the cable channels and then a diffusion sheet can be laid on top of them (you can use anything here, I used generic paper).

Finally you can put on the top covers.