Instructables
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Step 1: Step 1: Drill Holes

Picture of Step 1: Drill Holes
Drill 4 holes in the pipe insulation for the LEDs and then cut out a rectangle for the switch. Each hole should be evenly spaced out, we did about 1.5" between each LED. 

Step 2: Step 3: Cut out rectangular hole for the switch.

To cut out the rectangular hole, make sure to use sharp scissors. Also try to cut the hole a little smaller than the switch itself for the switch to fit snug inside.

Step 3: Step 2: Making a Circuit

Picture of Step 2: Making a Circuit
The Circuit is a Series Circuit. 

Step 4: Step 4: Connect each of the 4 LEDs with copper wire and solder

Picture of Step 4: Connect each of the 4 LEDs with copper wire and solder

Step 5: Step 5: Connect 12v Battery to the LEDs using the copper wire

Step 6: Step 6: Flip the switch to turn on and enjoy.

Picture of Step 6: Flip the switch to turn on and enjoy.

Step 7: Materials

Pipe Insulation (any length you want)
LEDs
12v Battery
Copper Wire
Paper Clips
Switch
 
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