I just did this for the toe kicks of my kitchen cabinets. Wasn’t looking for color, just warm white. Was relatively simple, turned out nice and didn’t cost much.
Here’s what you need to do...
You cut the strip to the length you need where indicated. That gives you two contact pads on each side, so the other piece has it later when you cut the next length.
Then you clip on the connection, and then connect that to the white thing hanging off the TRÅDFRI LED driver (not to be confused with a software driver). You get one of the IKEA cords for their LED drivers and you plug it into the other end to supply AC power.
I have a 2pin connector that will fit in the white plug, but the one pictured here or similar should also fit. The official IKEA LED plug for the DC voltage side is only available on their LED strips and pucks they sell. They clip in very easily and have a little release tab to keep them held in. The 2 pin plug (made by AMP) I have is slightly wider, so you get a really tight friction fit. Therefore there’s really no need for a clip. It’s not going anywhere. Old PCs often have 2pin plugs similar to that one in them. So there’s potential to find those for free. You might have to cut or sand off extra bits on a plug from a PC, but it would work.
However, all they have done is take the two white wires (24v DC output) and attached them to a wide connector that has 9 connectors in it. You could also just cut that off and wire the strip(s) directly to that white wire. Use a voltage meter to determine + and -, or just try it on the strip. It’s only going to light up if connected the right way. If the polarity is wrong, nothing will happen.
I liked the result so much, I came up with a way to make my my own diffusers and added more of them under my cabinets too, replacing the old fluorescent that was in use. I will say that those connectors are a pain to use. I’ve ended up using them, but soldering their contacts to the strips for better reliability.