# Is Light Energy? [duplicate]

I have been thinking about different forms of energy and ways to define them, but I realized that most elementary forms of energy are waves, such as light (a wave in the electromagnetic field). Waves are a transfer of energy, so does that mean light is a transfer of energy? Or is light itself energy?

Light can be said to have a certain amount of energy. For example, when describing light as a collection of particles (photons) the individual photon's energy is equal to $hf$, where $f$ is the frequency of the light and $h$ is Planck's constant.
• I think the fact that the photon is its own antiparticle clouds the issue. No-one would say an $e^+e^-$ pair is energy, but like light they can just appear when there is sufficient energy available. – JEB Aug 5 '18 at 22:55