How Many Photons Does a 25W Monochromatic Light Bulb Emit Per Second?

[soul5]

How many photons per second are emitted by a monochromatic light bulb (650nm) that emits 25 W of power?

W=hfo

hf=Ek + W

P=W/t


is there a way we can find power? how do I solve this question?

 

[Doc Al]

Hint: What's the energy of a single 650nm photon? (This is not a photoelectric effect problem.)