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This Book 18 defines a standardized interface between a LED Luminaire and a sensing/communication module (Luminaire Extension Module, LEX-M) that can be attached to the Luminaire. The interface is intended to be used in outdoor applications with high IP rating. The LEX-M may provide for example sensory inputs to the Luminaire or communication between the Luminaire and a network. For attaching the LEX-M to the Luminaire, the Luminaire features one or two Luminaire Extension Receptacles (LEX-R) and the LEX-M features a base plate. Figure 1-1 shows an informative 3D-drawing of the LEX-R and the LEX-M base plate.