Shulk Sword With Lighted Monado

My son decided he wanted to dress as Shulk for Halloween. If you don't know what that is (I didn't), then you probably don't need to make this. The centerpiece of the costume is Shulk's sword. It's huge. I made it out of a 2 foot by 2 foot by 1 inch insulation foam board from Home Depot. I'll include pictures of the finished product later. It turned out good enough to impress an 11 year old. So, I'm qualifying this as a success. But, the lit power symbol in the center of the sword was be