Hydrogen Fireball

What is the value wavelength max? What is the energy of the corresponding photon?
Upon exploding a Hydrogen bomb develops a temperature on the order of 10^8K. Assuming that the fireball behaves as a blackbody in some time interval
Lambda(peak) =0.02898 nanometers
E = 0.4281 x 10^5 eV each photon
I got the wavelength from Wien’s Displacement Law
I got the energy of the corresponding photon from Planck’s Law.
Hydrogen fireball