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Frequently, regularly turning lights on and off
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Posted by albert_135 Sunset 2 or 3 (My Page) on Wed, Jun 24, 09 at 11:31
| Someone must have discussed this here as the lights forum has been around for years hasn't it?
I seem to recall from my academic learning decades ago that plant lights did not need to be on for continuous hours. Turning them on for a few minutes and off for a few minutes over the period of hours would do just fine. The problem back then was the technology, flipping the lights on and off would shorten the life of the light unreasonably.
Now the questions. Was my academic learning correct? Will turning the lights on and off work? Has the technology improved? |
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RE: Frequently, regularly turning lights on and off
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Systematic Acquired Acclimation
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I have not done the experiment, yet light cycling on & off is called "pulsing".
There is a plant signal inter-action called "systemic acquired acclimation" (SAA) keyed to the light intensity.
A plant essentially gets adapted to a light intensity & then an intensity change can alter it's response. The SAA signal cascade reaches from the leaf all the way to the flowers' stems.
Pulsing might induce this SAA signal & fluctuations done in bursts (theoretically) will turn on & off all kinds of genes with favorable impact.
Hydrogen peroxide (H2O2) is one of the SAA signalers.
(So proponents of foliar spraying H2O2 may have another mechanism to explain some of their beliefs. Not subject of this post.) |
RE: Frequently, regularly turning lights on and off
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| Thanks, gringojay for the keyword "pulsing". I was able to find quite a number of links, some look quite academic, which was the sort of thing I was after. |
RE: Frequently, regularly turning lights on and off
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Hi albert,
Let us know your conclusion. |
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