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How to Induce Flowering. Because of photoperiodism, you can easily induce flowering in cannabis plants simply by changing your grow room light cyclesâreducing the light from 18 hours a day or more, to only 12 hours each day.
Flowering. With LED grow lights we mimic the seasons by changing the light cycle from 18 hours a day to 12 hours. Give your plants 12 hours of uninterrupted darkness and 12 hours of light to induce visible signs of flowering in two weeks or less. Adding more light to the plants also help give bigger flowers and yield.roper usage of LED grow lights will multiply the number of plants you have in a methodical and environmentally friendly way. Cloning require only 2-3 weeks in the vegetative state. Use an 18-20 hour ON cycle for your clone and spray it with water intermittently.