augustus

E= hv tells you how much energy a photon has. Still doesn't mean light is energy.

The first sentence says that photons "have" energy. This is how the energy of light quanta are referred to. This is because EMR is energy, so the second sentence is incorrect Light most definitely is energy E, equal to its frequency (multiplied by Planck's constant).

Photon, particle of light energy, or energy that is generated by moving electric charges.

Electromagnetic Radiation

Radiant energy that exhibits wavelength-like behavior and travels through space at the speed of light in a vacuum.

The energy of an electromagnetic mode is proportional to the square of the amplitude of the oscillating field. In classical physics the amplitude of the field can have any value and so the energy of a mode of vibration can also have any value. In quantum mechanics the energy of vibration of a mode of electromagnetic oscillating with frequency n in a closed cavity can only have a discrete set of values, E = nhn, where n = 0, 1, 2, 3... (Black body radiation, Planck and Einstein)

Electromagnetic energy is detected as quanta of energy called photons with energy E = hn. This explains the photoelectric effect, which is the ejection of electrons from a metal plate when it is illuminated by electromagnetic radiation above a cutoff frequency. (Einstein)

--physics.qc.edu/pages/genack/204%20Development%20of%20Quantum%20Ideas.doc.

Thought I'd clear that one up, at least.