338 posts since 17 Aug, 2004
Most modern 'intelligent' lights as they are known indeed use the DMX512 interface which is great for programming complex light shows but your typical club hardly ever goes to this much trouble. The light shows you usualy see are pre-programmed into the lights themselves and are activated as has been mentioned by by small microphones built into the light fixtures. The DMX is mainly used in this instance as a synchronisation protocol so tempo matching is the same across all lights. This doesn't mean though that these preset light sequences are at the same tempo as your music, they will just run at the factory default setting typically 120 bpm. Your average club punter is completely unaware of this and just sees 'cool' lights and probably couldn't care less as their focus is diverted by drinks, potential sexual encounters, fighting the bouncers etc. Your average club owner also knows the punters mind and that is why they can't be arsed about the issue of perfect lighting to music tempo.
OK back to god damn Traktor. Traktor is indeed quite capable of being the master clock for lighting. It has Midi clock output which can be used to control the tempo of a sequencer like Ableton Live and Live can be used to control lights via a Midi to DMX interface. This is a scenario that I use myself as I have DJ equipment and my own lighting fixtures. I use a Novation Launchpad to trigger clips from Live to drive my own programmed light sequences via an Enttec DMXis DMX interface.
Hope this helps cure your sickness.
Just make the music that you enjoy (failing that go for a walk, watch some porn, have a fight with a random bloke until something else happens).