Leprecon LP-3000 Series - Manual (Page 178)

174 Glossary
LP-3000 Users Manual
Crossfade: The action of changing from one scene to another. The intent is a smooth transition
from one look to another over a fixed time. The term “dipless” describes an algorithm that does
not disturb the level of dimmers with identical settings in the current and upcoming scenes. Each
scene in the chase is called a “step” and the number of steps is determined at the time the
chase is programmed. The “rate” of a chase refers to the time the steps are active before being
replaced with the next step.
Cue: See Scene.
Dimmer (Intensity Property): The high-performance Moving Lights of today usually utilize
discharge lamps as a light source. These arc lamps are compact, efficient and have a high color
temperature. On the down side, they require a large and heavy ballast and cannot be dimmed
electrically. As a result, the dimming system usually consists of a mechanical element such as a
disk with progressively narrower slots.
Dimmer: A solid state electronic device that controls power delivered to stage instruments.
Usually operates by AC power to incandescent lamps. Typically dimmer channels are built with
10 amp (1Kw) or 20 amp (2Kw) capacity.
Dimmer Channel: The control of a single dimmer. Dimmers have only one attribute—level.
Usually dimmers are controlled via a digital industry standard protocol called DMX512.
Dipless Crossfade: See Crossfade.
DMX Mode: For some moving light fixtures, you can select between several modes of operation.
A DMX mode requiring fewer channels will support fewer features or offer control that is less
fine. A DMX mode requiring more channels will support more features or offer finer control.
Effects (Beam Property): The number of elements that can be introduced into the optic path is
limited only by the imagination of instrument designers and the budgets of the users. Besides
the standards of gobo and color, several popular instruments incorporate another general-
purpose wheel for effects. These can include prisms to split the beam, color correction filters
and diffusion media or “frost”. The exact features that are loaded in an effects wheel can vary
widely.
Fader: A potentiometer that is used to set the level of a board channel.
Fixture: See Moving Light and Dimmer.
Focus: The position of the beam and sharpness or definition of the beam edge.
Frost (Beam Property): The number of elements that can be introduced into the optic path is
limited only by the imagination of instrument designers and the budgets of the users. Besides
the standards of gobo and color, several popular instruments incorporate another general-
purpose wheel for effects. Such effects can include diffusion media or “frost”.
Gobo (Beam Property): A gobo is a cut out pattern that is inserted into the beam so as to
project a pattern on the stage. The gobo has been around about as long as instruments with
lenses. As with color wheels, gobo wheels are positioned in the light beam and can be rotated to
the proper position on cue. Some gobo sizes are standardized which allows custom gobo
patterns to be fabricated and inserted into the gobo wheel for specific effects.