DIY stretched canvavas to LED strip backlight mod Part 1 and Part 2

Installing an LED strip behind a painting hung on a wall creates a nice lighting effect that highlights the artwork as well as providing a soft ambient light in the room. The electrical parts were sourced via ebay for about $10 to $20, while the PVC parts came from a local hardware shop (Bunnings). The following documents the evolution of this DIY project in two parts, 1) a simple stretched strip, and 2) upgrade to PVC molding.

Part 1

It is important to offset the frame from the wall, so that the LED strip has a place to sit, and has sufficient space for the light to leak out.

On the back side of the frame, install 4 screws at each corner, about 1 inch from the edge of the frame. Leave enough of each screw end to string the strip around it (about 10 to 15mm depending  on the screw head and any loose canvas that may interfere). Fine tune the screw lengths by hanging the painting, pressing on each corner in turn and checking for a wobble. In a way the whole assembly should be like a table with four legs -- it should not wobble.

Secure the LED controller module and 12V power cable so that the power cable exits the frame on the lower middle edge, to go to the power supply plugged into the wall. You need to have enough tension for the strip so that the lights point outward and avoid warping. This can be done by securing the power end to the frame, going around the screw corners and setting up a small loop at the other end by using the adhesive backing. You don't want too much tension (as that can damage the strip), or too little (as the lighting may not be uniform). Cut off any excess LED strip length in a suitable place; in this case I only used about 3m out of the original 5m strip.

Part 2

18 July 2016 update: the second painting

Back in mid 2016, when this project started, getting a quick win was the priority. It was worth it! In everyday life, these lights proved to be practical for their functionality, with a dimmable remote, as well as providing a wonderful relaxing evening atmosphere. However, it was always a longer term aim to install these lights properly on a rigid structure.

The advantages of this higher quality finish include: 1) improved uniform diffusion, 2) no twisting and sagging of the LED strip, 3) improved mechanical resilience against bumps.

The following shows how I installed PVC moldings to the frame.