[icewolf08]

Lets start with a quick overview of things. Using gel in general is a subtractive process. Each fixture outputs near full spectrum white light. When you put a gel in the beam, it only allows certain wavelengths of light to pass, the rest are absorbed. So you are subtracting certain colors from the light.

As you may already know, the RGB (Red Green Blue) color mixing system is an additive process. This is similar to how your television and computer display work. You start with three separate sources focused at roughly the same place, one in each color. In a perfect world, when you run all three at full you get white. At other levels you can mix to make a near infinite color palette.

CMY (Cyan Magenta Yellow) color mixing is a subtractive process. This process became a big hit with the advent of moving lights. CMY mixing requires starting with a single, full spectrum source. Using color filters you subtract varying amounts of CMY to mix the colors you want. If you were to roll all three wheels to full you would get no light out of the fixture.

SeaChanger added the xG (extreme green) wheel to their product because it helps achieve some deeper colors especially in primary colors. By the same token, many manufacturers of LED lights (an additive fixture) have added an amber in addition to the RGB to help make a more natural looking white. In fact, many lighting designers choose to use RGBA n 4-cell cyc fixtures.

So, you can put CMY colors in cyc units, but you will not be able to mix the same range of colors that you would if you used RGB. This is because you are inherently trying to utilize an additive process when you are using multi-cell fixtures. You might get some interesting colors, but probably not what you are looking for.