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Need help with LED lights Answered

Hey, I'm making an infinity tunnel/mirror based off an instructable on this site. https://www.instructables.com/id/cool-DIY-infinite-LED-tunnel/?&sort=NEWEST&limit=40

But the instructions are crystal clear and I'm running into a few road blocks. What kind of LED should I buy? They all have to be the same voltage correct? Does it matter if I connect it to a battery pack or the wall? What kind of battery should I use?

Basically I know nothing about electronics and I don't want to create a fire hazard. Any help is appreciated.

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