Many lights start out with one parameter set, and within a few months, an adjustment to the firmware has been made that will now allow you to have 16-bit pan and tilt or separate control over the gobo wheel parameter and its rotation parameter, Mspeed, etc... Then there are the lights that already have these different parameter configurations upon their initial release. These different parameter configurations are known as modes and are usually modified by setting the light's personality via its dip switches or menu platform, and sometimes by upgrading the firmware within the light itself. It's just as important to know a light's modes as it is to know its parameters. When telling the desk what kind of fixture you will be working with, you will often come across several different versions of the same light, the only difference being the mode of operation you wish to work with. If you don't know which mode is most suitable to your individual needs, you won't be able to benefit from either the extra control of the instrument or the conservation of DMX channels. – Courtesy of lighting programmer Christian Choi. www.christianchoi.com NOTE: this was posted on the [email protected] but I thought it was something that needed to be known by people who work with intelligent fixtures.