Can there be light without heat?

Yes, we can have light without heat. The light from such reactions is called cool light. Many chemical reactions produce both light and heat. A burning candle is such a reaction. It is much less common for a chemical reaction to produce light without heat. Such chemical reactions are called chemiluminescent reactions, the most familiar of which occur in living organisms. Fireflies produce light without heat through this reaction.

Cool Light, Chemical Reactions, Light and Heat, Chemiluminescent Reactions, Fireflies Produce Light, Burning Candle, Fireflies Produce Light, Living Organisms