Now I want to build and sell a diamond nuclear battery-powered, Japanese LED light orb structured so as one LED burns out, a previously-deactivated LED is activated, and a motion sensor-based power switch. Stick into a gnarled length of Australian Buloke wood and presto, a walking stick/staff of light that lasts hundreds of years, shake it to turn on/off, and so hard you can take a massive swing at an orc (or fellow SCA combatant) with spectacular results. Since I can't turn off the battery, I'll make it extract, liquefy and store hydrogen for a bonus fireball shooting feature, but that won't last as long.