Question

how is light formed and what's the byproduct of it except heat​

Answer 1

Explanation:

It turns out that, as often happens in science, that there is more than one way to explain the same basic phenomenon.

Tom Zepf of the physics department at Creighton University in Omaha, Neb., notes that "Sunlight heats a material such as water or a brick primarily because the long wavelength, or infrared, portion of the sun's radiation resonates well with molecules in the material, thereby setting them into motion. So the energy transfer that causes the temperature of the substance to rise takes place at the molecular rather than the electronic level."