Hi! My partner and I want to follow this guide and add LED strip lighting to bookcases we're putting up. Partner has significant experience with assembly/DIY home improvement projects, I have minimal but nonzero experience with soldering. We are both a bit lost on how to pick LED strip lighting and a controller.

Info about our setup:

• We will have several bookcases next to each other
• We would rather drill a slightly bigger hole in the side of the cases to pass the strip itself in between the cases rather than deal with extra soldering joints
• We have picked out conduit already (basically all of the non-electrical components)
• There are seven shelves on each case so we'll need seven LED strips
• There will be roughly 10 feet (a bit less) of strips per shelf, collectively across all the cases
• We would like to have RGB controls, but we don't care about syncing to music

Questions:

• What LED strips would you recommend? Longevity being probably the most important part
• What controller/power supply should we use? Keep in mind neither of us is super experienced with this kind of thing so the less complicated the better
• Anything else I should be asking that I'm not? Any advice in general?

Edit: Realized I sent the wrong link originally. This is the guide we're following.

This is one of those bizarre examples where I think a simple Google would solve the mystery, but I've tried dozens of searches like "halogen track lights with LEDs in center" and NO product comes up with it. Does anyone know what these are?? My guess is that it has to do with one of the lights being out, but why so many LEDs then?