The emission of a Lambertian radiator does not depend on the amount of incident radiation, but rather from radiation originating in the emitting body itself. For example, if the sun were a Lambertian radiator, one would expect to see a constant brightness across the entire solar disc. The fact that the sun exhibits limb darkening in the visible region illustrates that it is not a Lambertian radiator. A black body is an example of a Lambertian radiator.
the emission of a lambertian radiator does not depend on the amount of incident radiation but rather from radiation originating in the emitting body itself for example if the sun were a lambertian radiator one would expect to see a constant brightness across the entire solar disc the fact that the sun exhibits limb darkening in the visible region illustrates that it is not a lambertian radiator a black body is an example of a lambertian radiator