I have limited experience with moving-mirror fixtures, so I asked Marty Postma, lighting and video director for Alice in Chains, to explain how the Cyberlight tracks the band members. "First of all, you don't have the inertia of a moving head, so the mirror moves a lot faster, and it's a completely different quality of movement that doesn't look or feel like a traditional light," he said. "We have four Cyberlight 2.0 units up in the truss, and they're hooked into a Wybron AutoPilot system," Postma added. "It all works via infrared tracking. The guys wear a tiny belt pack that has a little infrared transmitter dot, and we have the receivers up in the truss. The belt pack could be placed anywhere, but since we're dealing with rock ‘n' roll performers, we put it on their guitar straps. There are also two packs for each musician, so that when they change guitars, the techs swap the packs to the next guitar."
From "Video World" by Paul Berliner, PLSN, April 2010
