Parallel rays of light of intensity $\mathrm{I}=912 \mathrm{Wm}^{-2}$ are incident on a spherical balck body kept in surroundings of temperature 300 K . Take Stefan-Biltzmann constant $\sigma=5.7 \times 10^{-8} \mathrm{Wm}^{-2} \mathrm{~K}^{-4}$ and assume that the energy exchange with the surroundings is only through radiation. Th final steady state temperature of the black body is close to: