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The effect of LED inter-lighting on (A) diurnal photosynthetic photon flux density (PPFD) and (B) photosynthetic rate. Measurements were made on 14 February using fully expanded mid-canopy leaves from control plants and plants exposed to daytime or nighttime LED inter-lighting treatments. Daytime LED inter-lighting was provided from 4:00 am to 4:00 pm and nighttime from 10:00 pm to 10:00 am.
