  We study the effects produced by nonlinear electrodynamics in spacetimes
conformal to Bianchi metrics. In the presence of Born-Infeld type fields these
models accelerate, expand and isotropize. This effect is compared with the
corresponding to a linear electromagnetic field; it turns out that for the same
geometry, Maxwell fields does not favour inflation as much as Born-Infeld
field. The behavior of the nonlinear radiation is analyzed in terms of the
equation of state. The energy conditions are analyzed as well, showing that the
Born-Infeld field violates the strong energy condition.
