Your power is going to be Watts/time. Since E=hf, you can determine the energy of a single photon if you know its frequency. So h*f*(#
photons) will give you the total power for a given number of photons.
Set this equal to Watts/time. Thus the number of photons = Power/h*f
There is a very good paper on this in Ann. Phys. 17 on page 132.
Or, if by power you mean flux, integrate over the surface area to get
the actual power.
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