The GLP Impression X4 XL-MA Custom RGBY is a high-end, large-format moving head wash fixture designed for the most demanding professional lighting applications in touring, theatre, television, and major live events. This fixture represents a top-tier product from German Light Products (GLP), renowned for its innovative optical design and build quality. The "XL" designation indicates an extended lens system and larger format, producing an exceptionally wide, smooth, and intense field of light ideal for washing massive stages, architectural facades, or creating vast color fields. The "Custom RGBY" color system signifies a tailored four-color LED engine utilizing Red, Green, Blue, and dedicated Yellow (or Lime) emitters, which significantly expands the color palette, particularly in the cyan-green-yellow-amber spectrum, enabling richer pastels, more vibrant saturated colors, and superior color rendering for skin tones and scenery.

The fixture's optical core is its defining feature. It employs a sophisticated, motorized zoom system with a very wide range, allowing the beam angle to be adjusted seamlessly from an extremely narrow spot to a super-wide flood. This is complemented by GLP's patented "CrispFocus" technology, which ensures a perfectly uniform field with a sharp, hard edge even at maximum zoom—a characteristic highly prized by lighting designers. The fixture offers extensive effects such as variable frost, strobing, and precise dimming, all controllable with 16-bit resolution for buttery-smooth transitions. Fast and accurate pan/tilt movement allows for dynamic repositioning.

Built to the highest standards for touring durability, the Impression X4 XL features a robust housing with efficient, quiet cooling. It integrates fully into modern lighting networks via DMX512, RDM, and often Art-Net or sACN. The combination of its expansive output, unparalleled optical performance, rich custom color mixing, and professional reliability makes this fixture a premium tool for lighting designers who require the ultimate in creative flexibility and visual impact for large-scale productions.