I got some "bulk" 12-V LED strip a couple of years ago and the self-adhesive backing didn't last one trip, so I put them in acrylic tubes. I used a 1/2" square tube for my galley light
Here's the raw strip
Here's a view of the strip in the tubing with the in-line switch. The tubing is glued to the underside of my hatch with RTV.
I used 1/2" round tubing for the strip light in the cabin and mounted it with Mini-Maglite holders. Sorry no pix of cabin strip light.
<Chas>