Far red 730nm light.

[growsinse79]

I was thinking I might want to try for putting them to bed. What would I want for a 2 x 4 and where do i get it?

 

[moe.red]

You want a red/far red ratio in the 2:1 range.

So it depends on your main lights.

I used a pair of 30W 4' LED bars in a 4x4.

30 mins before main lights out until 30 minutes after.


Phytochromes are reversibly transformed by red and far-red light between conformations with different absorption spectra. The light-sensing moiety in all phytochromes is a covalently attached bilin chromophore. Following synthesis in the cytoplasm, the phytochrome apoprotein binds chromophore and, in the absence of light, this holoprotein folds into a stable, red-light-absorbing conformation, Pr. Absorption of red light by Pr converts the protein to the far-red-absorbing conformation, Pfr. Absorption of far-red light by Pfr converts the conformation back to Pr (Figure 1). Hence, to a first approximation, phytochromes can be thought of as reversible red/far-red light-activated molecular switches.

The phytochrome red/far-red photoreceptor superfamily - Genome Biology

Proteins of the phytochrome superfamily of red/far-red light receptors have a variety of biological roles in plants, algae, bacteria and fungi and demonstrate a diversity of spectral sensitivities and output signaling mechanisms. Over the past few years the first three-dimensional structures of...

genomebiology.biomedcentral.com

 

[steamroller]

This idea may help turn your Sativa girls.

 

[growsinse79]

This idea may help turn your Sativa girls.

Thats what I was thinking. HLG used to sell a bud initiator far red. All I see now is a 4' 730nm on amazon for $130

 

[Max]

Did you get much stretch running them @Moe.Red

 

[moe.red]

Did you get much stretch running them @Moe.Red

I'm not sure I would call it stretch, but yes it has an effect. The plants grow wider for example because they think they are in shade and try to find light horizontally. Helps when scrogging.