Hi Babar,

One of the problems I see with IR is that video cameras tend to see it too - you get a "blue" light in the picture in my experience.

A little scanner wouldn't take a lot of power, though it would be impossible to screen out any other warm sources.

Brian's idea is the best I've seen so far, but the reflective tape isn't going to look too good on camera either.

I have seen RF solutions to this problem for theatre work, where the fololow spot stays on somebody without needing a guy to guide the light. I'm not sure how they work.

Steve