photophase
/ˈfoʊtoʊˌfeɪz/
noun
- The light period in a cycle of light and darkness, especially in experiments or controlled environments.
- In the lab, the photophase lasted 14 hours and the dark phase 10 hours.
- The scientists adjusted the photophase to mimic summer conditions for the insects.
- Plants grown with a longer photophase tend to grow taller and faster.