Usually growers using lights force their plants to flower under 12 hours of darkness each cycle. Most domesticated indoor varieties ripen 8-12 weeks after forcing. However, if the dark period is increased the flowers will ripen in a shorter period of time at the expense of growth.
Plants given 16 hours of darkness a day, and 8 rather than 12 hours of light, will ripen 20-30% faster than plants under a regime of 12/12. But you can expect yields of only 50-60% normal. The reason for this is simple – light plus water, nutrients, temperature and good environmental conditions equals growth. Plants exposed to less light produce less growth.
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