DMX is the protocol that controls disco lighting. I picked it up as a hobby in 2005, starting off with 4 led par cans and Behringer desk. In mid 2007, I changed from the Behringer to computer software + DMX-to-USB interface. At the moment, I have two stage blinders (12R 12G 12B 3W LEDs each), an Astro LED mirror ball, an Antari fogger, an EVO 5 projector and two LED bars, all DMX. I did also used to have a couple of moving heads but recent redundancy/unemployment forced the sale of those :-( I will expand when I'm working again. OcUK is a well-attended board, so I'm hoping that there are other DMX hobbiests who can compare notes.