The LEE capable of emulating the echoes of a spatial lidar at three wavelengths (355 nm, 532 nm, and 1064 nm) was developed. In general, it enables the characterization of the critical optical parameters of the detection chain of a space or airborne lidar. The LEE allows short overlapping echo with long echo with 63 dB dynamic range. In-depth characterization of the lidar detection module will evaluate compliance with the requirements for which it was designed and feed future designs with actual figures from the lidar detection chain.