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GrowthStarLED.com - What are 730nm Night Treatments?


What are 730nm Night Treatments?

What are 730nm night treatments?

For most strains of marijuana to flower, a 12 hour night cycle is required before plants will begin their flowering phase. Indoor cultivators have been experimenting with light cycles right from the beginning, artificially dictating the length of growing and flowering seasons.730nm Night treatments can shorten nights or extend days, its up to you.

Photoperiodism and Phytochromes

Photoperiodism, simply put, refers to reactionary flowering based on the length of the day and night cycles.  read more here

Many growers are not aware that the actual triggering of flowering occurs during the dark cycle, not while the lights are on. This is why traditional lighting cycles are based on a 12-hours-on and 12-hours-off photoperiod. Photosensitive plants grown indoors require at least 12 hours of darkness to properly trigger their flowering response and to produce bountiful flowers. Innovative horticultural lighting manufacturers, particularly those producing induction technologies, are now integrating 720 to 740 nm LEDs that come on at the end of the light cycle. The added 720 to 740 nm spectrum produced by these LEDs simulates the spectrum produced by the sun at sunset and triggers the flowering response more quickly. The simulated sunset spectrum allows plants to relax more quickly when entering the dark cycle.

Plants grown under traditional lighting cycles can take up to three hours to relax into a state where they begin the flowering response while plants provided with the 720 to 740 nm spectrum at the end of the light cycle will act more like plants grown outdoors. The biggest advantage of lighting systems that use the 720 to 740 nm LEDs is that they allow the grower to increase the lights-on duration by an hour or two. This provides more energy to the plants and helps them produce larger and more prolific flower sets.

Eric Hopper –Maximum Yield

So, how do plants know how long they have been in the dark?

Phytochrome is a homodimer, protein molecules produced by the plant acting as a light-absorbing molecules.

During the day cycle these proteins absorb red 660 nm, signaling to the plant the length of the light cycle.

During the night cycle these proteins spontaneously convert back to their previous state, again signaling the plant the length of the night cycle.

What are the advantages of 730 nm night treatments?

By quickly converting photochromic triggers, a plant almost instantly goes into its nighttime mode, instead of almost the two hours it would take to convert the proteins without exposure to this “Artificial Sunset”


So how can indoor cultivators take advantage of these proteins?

Exposure to 730 nm light spectrum convert these proteins much quicker, essentially telling the plant it’s been in the dark a couple of hours, in many ways it re-creates red August sunsets, rich in the far red light spectrum, this is nature’s way of telling plants to begin their flowering cycles.

Implementation of this technique has not been standardized

Marijuana cultivators have adopted several methods of delivering night treatments:

  • Exposure between five and 20 minutes, either just before the night cycle or the first minute of the night cycle.
  • Other horticulturists I’ve spoken with are experimenting with bursts of 730 nm throughout the night cycle.
  • Small 8 W LED focused onto each plant or large 200 W emitters to cover entire rooms.

It seems marijuana cultivators now have the choice of either adding an additional two hours of daylight into the cycle for increased flower production, or by reducing night cycles by two hours, may be able to reduce the overall length of the flowering cycle up to one week.

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