Light
Energy released refers to the total amount of energy given off or produced during a chemical process or reaction, typically in the form of heat, light, or sound.
Enthalpy change is the heat energy transferred during a chemical reaction at constant pressure.
Calorimeter: A calorimeter is an instrument used to measure the heat absorbed or released during a chemical reaction.
An exergonic reaction is a chemical reaction that releases energy, usually in the form of heat or light.