Proceedings of the Fourth International ISHS Symposium on Artificial Lighting, p. 83 (2002)
Growing Greenhouse Tomato and Sweet Pepper under Supplemental Lighting:
Optimal Photoperiod, Negative Effects of Long Photoperiod and their Causes

D. A. Demers, Andre Gosselin

Although long term use of continuous light is detrimental to tomato and pepper plants, vegetative growth and fruit production of both species can be improved by short term use (5 to 7 weeks) of continuous lighting. Compared to shorter photoperiods, continuous light (24-h photoperiod) increased the leaf levels of hexoses in tomato, of sucrose in pepper and of starch in both species.

Continuous lighting biblio