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We use Luxeon brand LEDs. They are extremely bright versions of the LEDs you may have seen in small key chain flashlights. In fact, LED sabers are basically really powerful flashlights. The color is determined by the LED in the hilt. A Polycarbonate blade is used to contain the light. A diffuser and optics are also used to direct the light up the tube. LEDs are much brighter than the brightest EL. The downside is that the color is not even (the light will fade more towards the end of the blade and tends to flare at the base). Changing colors is not as easy but there are two options: The Modular Hilt System using a quick change kit, and colored discs. The quick changes' disadvantage is that is requires unscrewing the blade holder and unplugging the LED. The color discs work by using a white LED. Changing colors is achieved by removing the blade and placing the filter over the LED and optics. The disadvantage is that a filtered LED will always be less bright than the pure LED of that color. LED blades are 1" in diameter.