A tall white pyramid by day, this Christmas decoration really shines at night from the glow of 100 LED lights.
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Measure and mark the center of one 30-inch edge on the corrugated plastic sheet (see Lighted Spire Cutting Guide). On the opposite 30-inch edge, measure and mark 7-1/2 inches in from both sides. Mark the three triangles that will form the three faces of the spire.
Tape a metal straightedge beside one of the lines you marked and carefully cut along the edge. Repeat for the remaining lines to make the three sides. Save the two right triangles to use later as a drilling guide for the LED lights.
Tape the two right triangles together to form one the size of your spire sides. To create a pattern for the lights, make 33 pencil marks on the template no more than 2-1/2 inches apart and no closer than 1-1/4 inches from the edges. After you create the light pattern you like, stack the guide on the three spire sides and hold them all together with painter’s tape.
Use a 3/16-inch bit to drill a hole through the guide and three sides. After the first hole, place the tip of a bulb from your light string into the opening and check for a snug fit -- switch to a smaller or larger bit as needed. Drill the holes marked on the pattern. Remove the tape and discard the drilling pattern if you’re only making one spire. If you’re using a 100-light string, you’ll need to drill an additional hole in one of the sides.
Lay the three triangles edge to edge with the good side down and join them at the edges with clear packing tape. Press the tape firmly against the surface and trim off the excess.
Starting at a bottom outside corner of the left triangle, push bulbs through the holes you drilled. Work your way to the peak of the left triangle, down the middle triangle, and back upward on the remaining triangle.
Stand the triangles on their base and, one by one, fold them at the seams. Work carefully as you near the peak. Once the sides are in place with no gaps, cover the outside seams with white electrical tape.
If there’s no snow to hold the spires in position, drill centered holes in each side about 1 inch up from the bottom. Insert 4-inch landscaping fabric pins through the holes and drive them into the ground to hold the spires steady.