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This work intends to give the state-of-the-art of our knowledge of theperformance of LEKIDs at millimetre wavelengths (from 80 to 180~GHz). Weevaluate their optical sensitivity under typical background conditions andtheir interaction with ionising particles. Two LEKID arrays, originallydesigned for ground-based applications and composed of a few hundred pixelseach, operate at a central frequency of 100, and 150~GHz ($\Delta \nu / \nu$about 0.3). Their sensitivities have been characterised in the laboratory usinga dedicated closed-circle 100~mK dilution cryostat and a sky simulator,allowing for the reproduction of realistic, space-like observation conditions.The impact of cosmic rays has been evaluated by exposing the LEKID arrays toalpha particles ($^{241}$Am) and X sources ($^{109}$Cd) with a readout samplingfrequency similar to the ones used for Planck HFI (about 200~Hz), and also witha high resolution sampling level (up to 2~MHz) in order to better characteriseand interpret the observed glitches. In parallel, we have developed ananalytical model to rescale the results to what would be observed by such aLEKID array at the second Lagrangian point.

Lumped element kinetic inductance detectors maturity for space-borne instruments in the range between 80 and 180 GHz