[weedomat]

Hi

While reading in a german growing board i stumbled upon an interesting method to increase yield / reduce overall flowering time.

The theory is that one can use Far-Red light (730nm) to reduce the minimum darkness time the plant needs every day to keep flowering. Far-Red light supposedly increases the transition of Pythochrome-Pfr to Pythochrome-Pr in the plants, which triggers the creation of the hormone that keeps the plant in it's flowering cycle.

It is done by adding a far-red LED (for example: "SpectraBoost PAR-FR15") light to your normal growing light. The LED is kept running around 15mins after you normal light turns off. This is supposed to decrease the needed darkness period from 12 to 10 hours, which can be used in two ways:

1. Increasing yield:
   By running a 14/10 light cycle instead of 12/12 one increases the amount of photosynthesis done by the plant and therefore increases yield.
2. Decreasing overall growing time
   By using a special timer and an 12/10 cycle one can decrease day length for the plant and therefor decrease the time the plants need to mature.

My question about this is simple: Has anyone here ever tried this and knows whether this actually works ?
I've done a bit of reading and it seems that the theory behind it is sound, but somehow it all seems to good to be true

I read a while back something about a "Martian Nights" light technique that was quite similar, but I don't have any personal experience or hard data to either prove or disprove what you have read. Perhaps someone else here has actually tried this?

[weedomat]

I found some more stuff on this topic:

Here someone is attempting an comparison grow using 730nm and an 11/1 cycle, unfortunately it seems to fail at some point due to technical reasons
https://forum.grasscity.com/indoor-gr...xperiment.html

Also here is another discussion about 12/10:
https://forums.cannabisculture.com/fo...437769&fpart=2

and some more about the mechanics behind it:
https://www.*****.com/boards/index.php?showtopic=262292

[pezmasterelite]

Hi,

EDIT: Sorry if you read the old post, I re-read the initial and it was not relavant, too medicated...

I have read people using similar photo-period manipulation before with some side-effects. Are you, or the people who came up with this insinuating that the far-red light will lessen these side-effects? If so that would be interesting, I am always pondering using different spectrums of light at different times, blue in the morning, far-red at night, etc...

pez

[Greenheart]

I ran some halogens last year. There was at least a 7-10 day reduction in bloom time.

[supermanlives]

sounds like someone should be doing a test.

[weedomat]

i stumbled upon this topic reading this thread:
https://www.grower.ch/forum/showthre...-Kush-LED-Grow

he will attempt to do flowering with a 14/10 cycle, however he's still in veg.