During photosynthesis, the light reaction produces several key...

During the light reaction of photosynthesis, light energy is captured to produce ATP and NADPH, with $\mathrm{O}_2$ being released as a byproduct.

The $\mathrm{O}_2$ diffuses out of the chloroplast, while ATP and NADPH are released into the stroma.

In the stroma, ATP and NADPH are directly consumed in the biosynthetic phase (Calvin cycle) to drive the reduction of $\mathrm{CO}_2$ into carbohydrates.

Answer: ATP and NADPH