Norty is spot on, 32 fixtures. You can run more, far more in fact depending on what fixtures you are using as quite a few higher end products now are capable of amplifying the output, more shocking is the amount of Chinese 'copies' are actually better specced than 'western examples ' I've actually invested heavily this year in one supplier and the equipment standard is a world apart from years gone. Some truly Original ideas and designs.
Cable quality is also a factor with dmx as loss down cheap 'microphone ' xlr cables quality can be crap.
Van Damme or Klotz - expensive but why give yourself headaches?
lighting the way since 89