Cosmic Light With LEDs Embedded in Resin

Step 4 Electrical Set-Up

Now you need to do a little electrical work.

If you've never used them (and I hadn't before I made this) alligator clips are just an easy way to test out your LEDs. You'll need a pair, and some wire to attach to the clips (unless you find some with wire already attached.) I bought the insulated wire that was next to the alligator clips, it's 14 gauge. Cut 2 reasonable chunks of wire - around 6 inches - and strip a half inch or so from each end. Attach one end of each wire to a clip.

Put the batteries in the battery holder. Attach a clip to each terminal. Grab an LED and touch a wire to each side of it. This will help you figure out positive from negative. When it lights up you've connected the positive battery terminal to the positive side of the LED, and vice versa. On mine the negative side was notched at the corner. Check all of the LEDs you're using, because you would be really bummed to put out all of the work to make this and then have one not work. Be sure sure sure you know positive from negative.