Dear T H,
OK, good points. It does not matter if a photon is visualized as a point or blob. And agreed, localized or wave aspects depend on the experimental setup. I do not see why something I did was unfair though. Many people think of the photon as consisting of a quantized amount of energy because Einstein said so in the 1905 paper:
"According to the concept that the incident light consists of energy quanta of magnitude (equation hf), however, one can conceive of the ejection of electrons by light in the following way. Energy quanta penetrate into the surface layer of the body, and their energy is transformed, at least in part, into kinetic energy of electrons. The simplest way to imagine this is that a light quantum delivers its entire energy to a single electron: we shall assume that this is what happens. The possibility should not be excluded, however, that electrons might receive their energy only in part from the light quantum."
This is really interesting because in the last part of this quote he actually acknowledges the loading theory. Einstein was pretty sharp. However, most physicists use the quantized light model. A few posts below I quote the definition of the photon based on experiment, that I and many physicists use. The important point is that the experiments I do contradict the particle aspect of the definition. Therefore I say we should not describe light using the photon word at all. It is difficult because we really need a new word to replace photon. I like to just talk of an "h-new" for the energy quantized at light emission, or reached at a threshold of light absorption in matter. When NOT dealing with the quantized emission aspect of light, or reaching the threshold hf of kinetic energy in matter, please IMHO, we should just talk of light in space, and not photons.
One more point. I took down my link above to my paper Experiment Reveals an Understandable World, because the writing needs editing. I can sometimes come across too confrontational for some people and make steam come out of their ears. Thank you, ER