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I cannot say anything about the general case, or specifically for day-neutral plants. However, Sforza et al. (2012) have studied the effects of light conditions on algae (used for biofuel production), and their results indicate several problems with continuous light. In continuous light conditions they find lower chlorophyll contents and higher carotenoid ...


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It isn't really a specific light intensity that an organism will interpret as the start of a photoperiod. Maynard Johnson reported in 1939 that intensity of light used had an effect on the rate at which mice would shift their circadian rhythms. So, brighter light has a stronger effect, but there isn't a cutoff point that I'm aware of. Johnson was using ...



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