  The ARGO-YBJ experiment is a full coverage air shower detector operated at
the Yangbajing International Cosmic Ray Observatory. The detector has been in
stable data taking in its full configuration since November 2007 to February
2013. The high altitude and the high segmentation and spacetime resolution
offer the possibility to explore the cosmic ray energy spectrum in a very wide
range, from a few TeV up to the PeV region. The high segmentation allows a
detailed measurement of the lateral distribution, which can be used in order to
discriminate showers produced by light and heavy elements. In this work we
present the measurement of the cosmic ray light component spectrum in the
energy range 3-3000 TeV. The analysis has been carried out by using a
two-dimensional unfolding method based on the Bayes' theorem.
