To ensure that the light (emitted far away from source of gravity) can arrive at null infinity an asymptotically flat spacetime, it is shown rate Bondi mass aspect has to satisfy some conditions. In Einstein gravity theory, we find sufficient condition implies a bound on loss, i.e., $|\stackrel{\ifmmode \dot{}\else \textperiodcentered \fi{}}{m}|\ensuremath{\le}0.3820\text{ }\text{ }{c}^{3}/G$. ...