Needed some lamp holders to populate my aquarium with WS2801 LEDs controlled by Raspberry Pi Zero. This is my first thing published!
The LEDs snap nicely into the holes and stay firmly placed. The LEDs are in blocks of 10 and a 5 mm bolt goes through to hold two together and fix to the aquarium. The only thing that I'd change is the strength of the bolt area, it's OK when bolted together, but way too weak to take the weight of the LEDs and cabling unsupported.
Some discussion of the Raspberry Pi etc. here: http://applecrumbleandcustard.com/fish-pi-leds/