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