Calculating Power of an Electromagnetic Wave from a Single Photon Source

[Prasanna Suman]

i desperately need the equation which relates the power of a an electromagnetic wave from a source which continously emits only one photon at a time.

 

[masudr]

$$\mbox{Power} = \frac{\mbox{Energy deliverd}}{\mbox{Time taken to deliver energy}}$$

Do you know the energy of these photons and the rate of their emission?