Iray Light Probe Kit is an omni-directional, invisible, ambient lighting solution for Iray. ILPK uses a network of spherical probes to illuminate areas that Iray might have trouble reaching, especially directly. This helps darker area's of your scene converge faster, and reduces noise.
The probes are manually placed, but a set of pose presets are provided to aid in placement. Each probe can be given unique lighting values, and a set of color/intensity presets are provided to cover most use cases.
ILPK can be used in addition to the uni-directional ghost light series, or as a standalone lighting solution.