Posted:Im sure the bulb is an LED which many people attach to poi. There are also manufactured ones you can buy on HoP's shop.
As for banning them because they strangle children, that's just comical. How the hell could they possibly kill a kid? It requires quite a bit of pressure to strangle someone, it's not like you could possibly wrap it that tightly around your neck unless you were activly pulling it tighter with your muscles instead of just the momentum of the yoyo. It would take a pretty funky (read unlikely) tangle to make it actually keep up this amount of pressure without it slacking up when the kid stops pulling on it. So the kid would pass out and the string would loosen up and the kid would be able to breath again.