Links  

History of Disco Lighting:
http://www.njd.co.uk/hodl.html  

Vortex:
http://www.americandj.com/product.asp?ProductIDNumber=789&cat=Lighting_DISCONTINUED--Product Info
http://www.americandj.com/pdffiles/VORTEXG.pdf -- Vortex User Manual  

Stepper Motors:
http://www.doc.ic.ac.uk/~ih/doc/stepper/index.html -- overview
http://www.cs.uiowa.edu/~jones/step  -- a tutorial on control  

Where to Buy Club Light:
http://www.americandj.com  -- the main retailer of Club Lights
http://www.mbtlighting.com/  :  -- Higher-end Club Lights

DMX Info:
http://www.epanorama.net/links/lights.html#control – DMX broad overview
http://www.pangolin.com/LD2000/dmx-about.htm -- DMX pinout and cabling details
http://www.rosco-et.com/dmxtour.htm -- DMX tour
http://www.dmx512.com/web/light/dmx512/index.htm -- DMX technical info
http://ftp.unina.it/pub/electronics/ftp.armory.com/DMX/ -- DMX technical documents

Light Chaser Circuits:
http://members.fortunecity.com/techman10/lights/audio_tr.html