[VerdantGreen]

welcome back spurr

[superpedro]

Hey.

Did you know switching shutting off the f-red spectrum the last two hours, and having a peak in intensity around the middle of the light period is the optimal cycle for minimal stretch.?

[Weezard]

Originally Posted by superpedro

Hey.

Did you know switching shutting off the f-red spectrum the last two hours, and having a peak in intensity around the middle of the light period is the optimal cycle for minimal stretch.?

Is this first hand experience?
Theory?
Cited reference?
Please expand.

Aloha,
Weezard

[superpedro]

Much of the info I have got is from Fiona lightings test runs of LED setups at the PKM plant nursery in Denmark.
It has been known for a while, some studies by DTU photonics showed it a few years back.
We have been getting advice about using special curtains to block out f-red for the last two hours to minimize stretch, since it reduces our use of chemical retardants.

I don't have any first hand LED knowledge yet. But i guess you know what I do..


Just want to tell you all what I am told.

[superpedro]

lol.. On the crazy side. They did some experiments on some SDP's giving them two extra hours of only blue in the flowering period(1h blue, 12 hours normal light, one hour blue), and it made the plant veg and flower at the same time. Got very stretchy too.
Probably didn't end up usable, haven't heard about it since.


Exiting future for plants

[hades]

Hi everyone,

Just found this forum and am pretty interested, I've always wanted a sub-forum like this.

Have you all ever read of using red plastic mulch to increase the red:f-red ratio? There are companies that sell it for this purpose, as well as to keep soil temperature constant/hotter and to reduce erosion and water evaporation.

This was something that I really researched back in the Overgrow days. This thread totally took me back. No one knew about it back then, but the science was there.

See you all around more!

[spurr]

Originally Posted by VerdantGreen

welcome back spurr

Thanks for bringing me back! And for being the catalyst for this sub-forum. I owe ya, and Gypsy and OldPink too!

[Dave Coulier]

Originally Posted by hades

Hi everyone,

Just found this forum and am pretty interested, I've always wanted a sub-forum like this.

Have you all ever read of using red plastic mulch to increase the red:f-red ratio? There are companies that sell it for this purpose, as well as to keep soil temperature constant/hotter and to reduce erosion and water evaporation.

This was something that I really researched back in the Overgrow days. This thread totally took me back. No one knew about it back then, but the science was there.

See you all around more!

Using red plastic mulch actually increases the far red:red ratio over the incoming light sources fr:red ratio from what I have read. White mulch will have the same reflected far-red:red ratio, and will provide the same benefits with regards to soil temp, water loss.

Check out this PDF to learn more.

[imadoofus]

it has been speculated on other forums ambient temperature fluctuations during the day/night cycles contributes significantly to stretching during the onset of flowering.

several mods on serious seeds forums relate similar validations regarding this.

researching different light studies for my upcoming mh/hps comparison has revealed a reoccuring theme on how regardless of using a mh/hps for flowering, the stretch was the same given for each strain used.

[spurr]

Originally Posted by imadoofus

it has been speculated on other forums ambient temperature fluctuations during the day/night cycles contributes significantly to stretching during the onset of flowering.

Yes, see what I wrote about "DIF".