Lidar technology is a remarkable complement to traditional met mast anemometry during the assessment of the wind resource and for the measurement of wind turbine power performance, as it is highly mobile and only requires minimal logistic for deployment. Numerous inter-comparisons with IEC-compliant cups in a variety of meteorological and topographical conditions have shown good match between the instruments in the retrieval of the wind speed values, but have also raised questions regarding some remaining biases and outliers. Sources of them can be related to the technology and also to specific atmospheric conditions and therefore must be investigated. The high number of on-site studies affords the possibility to make an empirical analysis of the lidar technology accuracy and quantify its uncertainties. Together with this practical approach, we theoretically describe their sources. The combination of fieldwork experiences and technological knowledge lead to a quasi exhaustive detailing of the lidar uncertainties and the quantification of those. This is a necessary requirement to reach traceability of performances of a remote sensing device and control its accuracy under the specific site conditions where it is planned to be applied for a wind farm project. In this presentation we propose to detail sources and ranges of uncertainties for the windcube pulsed lidar technology.