# Is there any difference between a proper photon and a photon of thermal radiation?

Does a thermal photon radiate spherically whereas a photon radiates in a circle/beam? How do you tell a thermal photon of, say 3 eV, from a photon of light?

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@John Rennie, Now, if I got it right, visible light is just thermal radiation.Since it has roughly 4000°K, it is correct to say that if we concentrate enough photons we can melt down any metal? –  bobie Aug 5 '14 at 9:37
Yes, bobie, that's correct. Google "solar furnace" for more information. Some can reach temperatures up to 3500°C. –  Nate Kerkhofs Aug 5 '14 at 12:10