  ARGO-YBJ preliminary results of the measurements of the all-particle and
light-component (i.e. protons and helium) cosmic ray energy spectra between
approximately 5 TeV and 5 PeV are reported and discussed. The resulting
all-particle spectrum (measured in the energy range 100TeV - 3PeV) is in good
agreement with both theoretical parametrizations and previous measurements. The
light-component (i.e. p + He) has been measured with high resolution up to
about 5 PeV. The preliminary result is in agreement with direct measurements
and then show a clear indication of a bending below 1PeV. Improvements of event
selection/reconstruction with the full statistics and a complete analysis of
systematic uncertainties is currently under way.

High Energy Astrophysical Phenomena