During the photosynthetic light reactions, a cluster of pigments and proteins called uses light and and proteins of the photosynthetic electron transport chain to produce (a form of energy) and the by-product .

Chlorophyll, water, ATP, NADPH

Explanation:

Photosynthetic light reaction takes place in the thyllakoid membrane of green plants. The Chloroplast of green plants harbors pigment molecules called Chlorophyll; which has the ability to capture the energy of light. This captured energy is used to generate high energy electrons which reduces NADP+ to NADPH and also produces ATP which are further used to produce sugar(food) in the next stage of photosynthetis called Calvin cycle.