I'm willing to say that I have a fair understanding of Electromagnetism, at least from a classical perspective, but I was never entirely clear about the difference between, say, the time-varying magnetic field created by an inductor and the Electromagnetic field of light in general. Based on what I understand, I should think that they are one in the same, the "Light" from the inductor simply being extremely long wavelength radio waves. Would that be correct? If it is, then why do we observe such incredibly different behavior from a transformer, a microwave, and a light-bulb? Does it really just boil down to the frequency/wavelength of the photons?