system
Given the following post, respond as if you're commenting on Reddit:
human
Why fire is so bright? Where does the light come from?

I guess, it may by a silly question, but why fire (I mean flame) is  bright? From chemistry point of view, of course, burning is oxidizing (acetification?). And burning gives both heat and light. Assuming light is nothing but photons, where do all the photons come from? Right now I'm holding a match in my fingers, and all it does is just reflecting light. But how does it start to emit photons as soon as I strike it? 

The same question can be applied to light bulbs. In this case electricity is converted to photons, is it? If so, how is it so? :)
gpt
In typical red-orange flames, the light emitted is due to the incandescence of soot particles. Little particles of half-burnt fuel get so hot from the reaction that they glow and emit light due to their temperature, just like in an incandescent light bulb. The energy that makes the soot particles so hot comes from chemical potential energy that is released when chemical bonds are formed. If you want to know why hot objects glow, the words to look up are "incandescence" and "thermal radiation". Basically, the hotter an object, the faster and more violently its molecules move around. Since molecules contain electric charge, the more violent motion of the electric charges creates higher-energy electromagnetic waves, i.e. emitted light that gets enough energy per photon that it can enter the region of the electromagnetic spectrum that is visible to humans. 

Note that your match is always glowing and emitting light. When unlit, it is emitting lower-energy light (infrared) that humans have not evolved to be able to see. When you strike the match, you ignite a chemical reaction with releases energy which causes the soot particles to heat up enough that they glow in the visible light spectrum as well as the infrared.