>> The energy of a photon is easy to look up, and depends only on the
>> wavelength (lower wavelength = more energy).
>
>  Are you sure the energy does not depend on amplitude?

Yes, the formula for energy of a photon only has one variable, wavelength.

> One would think
> that you need more energy for a larger amplitude.

You do, but that's just because you have more photons, not because each 
photon has more energy.

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