DIY concrete lamps with LED string lights

I just got a hold of a better apartment here in Tijuana, and was thinking of what to do with the lackluster lighting, especially with a wired-in berm in the ceiling at the division line between kitchen and living room.
Concrete would be a little risky, but wood would certainly do the trick.

Edit: I was just thinking…Glen’s hack is a little labor intensive when it comes to removal of the pvc pipe. I wonder if fitting a plastic sleeve or sheeting to the interior of the pvc would make it easier to slide the pvc off (maybe using a homemade press)?

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