Ask Ed Marijuana Grow Tip #29: 12-1 Light Cycle Theory
A theory is circulating Facebook about the 12-1 light cycle as an energy-saving technique that facilitates excelerated growth during the vegetative stage of growth. Personal attacks are irrelevant, here is the scoop behind 12-1:
Plant growth is based on photosynthesis, which produces sugar.
When sugar is combined with Phosphorus (P) and Potassium (K) it forms amino acids, which are the building blocks of tissue and plant growth.
The more light plant’s receive the more building block amino acids they produce, aka growth.
They certainly grow well under the 12-1 light cycle as being advertised, but only simply because they are getting more light. Although it saves energy, energy equals growth.
***Editors Note: Because marijuana is a short-day annual, it measures the length of the dark period to determine when to flower (ie: after summer solstice the dark periods get longer and longer outdoors. You can prevent flowering indoors simpy by interrupting the dark period. A flash of light, rather than a full hour is all that is necessary to interrupt the dark period, so more energy would be saved by simply shutting off the lights for a minute.