"light reaction." YourDictionary, n.d. Web. 11 October 2018. <http://www.yourdictionary.com/light-reaction>.
light reaction. (n.d.). Retrieved October 11th, 2018, from http://www.yourdictionary.com/light-reaction
Any of the chemical reactions that take place as part of the first stage of photosynthesis and require the presence of light, by which energy captured from light is converted to chemical energy in the form of ATP.