LED's!!! Not brand new, but advancements in the technology has brought them now to stages, events and even architectural use because of very low power consumption, extraordinarily long life and a fraction of the heat compared to incandescent lighting. In the past a typical lighting fixture of say, a 500 watt par can could be controlled as far as brightness (dimmers) and a color typically a gel. 1 can, 1 color 1 channel on a lighting control board.   LED fixtures present a revolution in what can be accomplished with a single fixture. "RBG" color mixing is the same technology used in modern projection TV's. The RED, BLUE and GREEN colored LED lights in an LED par can mixes hues of three colors in various intensities to create nearly any color of the visible light spectrum from a single fixture.
Using DMX 512 protocol, an LED par can or fixture will have typically have 3 - 6 DMX channels and a DMX address for the fixture. For instance...
Fixture 1 DMX address - 1    Fixture 2 DMX address - 7    Fixture 3 DMX address - 13  and so on six channels apart. Then each channel is programed at the address.
ch 1 - red intesity 1-255  
ch 2 - green intensity 1-255  
ch 3 - blue intestity 1-255  
ch 4 - color macro 1-255  
ch 5 - strobe and fx speed 1-255  
ch 6 -fader/brightness 1-255

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