There are quite a few nagging questions I have been having over the years, I do not require a full explanation, just some guidance in my assumptions and pointers if I am very wrong.
My basic knowledge of a lightbulb, is that the power dissipated by the tungsten filament heats it up to around 2,700–3,300K (inefficient!), emitting a yellow light. Something supporting my current (and next) claims is this image, see the bottom chart on temperatures:
With this, can I assert that fire is red (and yellow) due to the fact it is simply at those temperatures at where those colours are emitted, and it happens to emit those frequency photons? What is this called? I recall "thermionic emission" however, I am unsure if this relates closely to visible light as it does "heat".
Of course I've heard the phrase "white hot", iron (and other similar metals) melt at around 1800°K (tungsten at 3422°K), while that near-white temperature is below 10M°K! Not to mention it would glow green first before that blueish point. I will assert that metal cannot glow that hot - of course searching images of "white hot metal" come up with red-ish metal, however "white hot" is used often enough to cloud my memory.
"Colour temperature" is another confusing topic I have looked at, does it directly relate to the colour emitted at the above temperatures? I do not see "5000K" (often referenced as a blueish white) being white, unless other colours are combined, however how that is a "temperature" confuses me. Are they just separate from eachother?
I can also as a sanity check assume that some gas generated flames being blue, is due to the gas burning and not the temperature. Are all of my assumptions correct? Can you clarify or add anything?