Photon energy is the energy of a single photon (light particle). You can calculate it using the wavelength of light \( \lambda \). For example, if the light has the wavelength \( \lambda = 550 \, \mathrm{nm} \), then the energy of a photon is:\begin{align}
W_{\text p} &= 6.6 \cdot 10^{-34} \, \mathrm{Js} ~\cdot~ \frac{ 3 \cdot 10^{8} \, \frac{\mathrm m}{\mathrm s} }{ 550 \cdot 10^{-9} \, \mathrm{m} } \\\\
&= 3.6 \cdot 10^{-19} \, \mathrm{J}
\end{align}

Speed of light (in vacuum) is a physical constant and has the value:$$ c ~=~ 3 \cdot 10^8 \, \frac{\mathrm m}{\mathrm s} $$

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