  A spacetime denotes a pure radiation field if its energy momentum tensor
represents a situation in which all the energy is transported in one direction
with the speed of light. In 1989, Wils and later in 1997 Ludwig and Edgar
studied the physical properties of pure radiation metrics, which are
conformally related to a vacuum spacetime. In the present paper we investigate
the curvature properties of special type of pure radiation metrics presented by
Ludwig and Edgar. It is shown that such a pure radiation spacetime is
semisymmetric, Ricci simple, $R$-space by Venzi and its Ricci tensor is Riemann
compatible. It is also proved that its conformal curvature 2-forms and Ricci
1-forms are recurrent. We also present a pure radiation type metric and
evaluate its curvature properties along with the form of its energy momentum
tensor. It is interesting to note that such pure radiation type metric is
$Ein(3)$ and 3-quasi-Einstein. We also find out the sufficient conditions for
which this metric represents a generalized pp-wave, pure radiation and perfect
fluid. Finally we made a comparison between the curvature properties of Ludwig
and Edgar's pure radiation metric and pp-wave metrics.
