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I received a friend req from Shiggity on
IG.
Perhaps we may see him come back soon?
Have you talked to Shig? Man this is crazy. The Shiggityflip on IG is a different one I am pretty sure, they follow mostly female models from the looks of it. Sad ...
Shiggitty I plan to use qb18 (red, deep red fat red) for an after hour lights on and and hours before lights off. Sunup and down effect. During veg. It’s supposed to be for 12hours during flower. I’m not sure if I trust it not to cause sas. Opinions? I have a grow journal just couldn’t figure out how to message you otherwise.
I have the question listed with a few other led loving forums. Seems the consensus is that the qb18 DOES do ememerson so that’s growth but possible stretch in veg. Several said they don’t use it until after flower stretch even. I think I’ll just watch it. I don’t think at this point I can get lanky plants with it being on just an hour or 2 during veg. With temps being high in my room though I may not be able to have all the IR. Which is another reason I was thinking just an hour or 2 a day. Maybe lol start with just 1 hour in the morning a Nd see. After a few days add an hour at night.
I didn’t . Thank you. Any opinions from anyone?!
Miss ya my friend!!! Hope you come back soon to grace us with your presence![]()
I think I might be able to shed some light on your questions.... all puns intended
Stretch, Near Far Red, Red light:
In terms of stretch... this is something you may just have to try to find out. Popular belief is that adding red will cause stretch, but I haven't really seen any significant research that supports this theory. I have however seen research which suggests that the ratio of Red:Far Red is really what drives stretch. This relates to what they call "shade avoidance syndrome) where branching that is under the main canopy will stretch up to reach the direct sunlight. What has been found to cause this is the lack of "red light" and the abundance of "far red" light, thus decreasing the ratio of Red:Far red. Whenever the ratio of Red:Far red approaches a 1:1 (or much less) you will get more stretch as opposed to a 3:1 or 5:1 ratio of red to far red.
Being that the QB18 has both red and Far red, whether or not it actually causes stretch will depend on if it is increasing or decreasing the ratio of Red/Far red, and really the best way to see is to try it for a week or 2 in veg. If you see the internodes getting longer, then you know it will be causing SAS (Shade avoidance syndrome). By the way the correct term to use for 700-730nm light is Near Far Red and not IR.
- Sunlight has a R:FR ratio of 1.2
- Light under a canopy of leaves has a R:FR ratio of 0.13
- The more far red light a plant senses to red light, the more it will stretch because SAS is triggered and it thinks it is being shaded.
Emerson Effect:
In terms of Emerson Effect, if you have either white light, or "blurple with far red" or "blurple with white chips" or even just the QB 18 by itself, emerson effect will happen when you have both red light, and far red light together. I don't believe you can "cancel" this out as there are 2 photosystems in plants, PS1 and PS2. One of the photosystems ONLY receives light/electrons from light around 700nm (Visible light) and under, and the other photosystem only receives light above 700nm or above (near Far Red light). When you have both Red/Visible light and Near Far Red light you will get the emerson effect.
Sunup/Sundown and Far Red light:
You had mentioned about using the QB18 for sunup and sundown and I don't really think that its going to do what you may be referring to. There have been numerous different LED companies who have come out with "bloom enhancers" using only 730-750nm near far red light which generally are used right after "lights out" for 15minutes or so, and some people also use them right before the "lights on" phase during their flowering period of 12/12 or similar. I have tried this with 730nm light in pseudo experimental grow which did seem to speed up my flowering period finish time by about 1 week. (this was a non contolled test so it was based on past grows vs the Far Red grow and related data, so far from perfect).
I have heard from some people that using Red and Far Red light together can also work for this, however the amount of Red used would have to be fairly minimal for this to work, as Red light does the opposite of Far Red light when used for phytocrhome conversoinl
What happens is there is phytochrome which has 2 forms, active and passive.
*****This is also why the Gas Lantern Routine aka 12-1 also works for keeping plants in veg. Red light quickly will change Pr to Pfr, therefore when using the GLR, the 1 hour of light in the middle of the dark period quickly changes the phytchome back to Pfr, and the remaining night (5.5hours) isn't enough to fully convert the Pfr back to Pr because of the night interruption as that process is much longer.
- When phytochrome absorbs Red light during "daylight hours" it turns it from (Pr) passive to its active form (Pfr) .
- When phytochrome absorbs Far Red light it turns from its (Pfr) active form to (Pr) passive form.
- The process of turning from (Pfr) to (Pr) naturally happens during the dark cycle (as long as it isnt interrupted).
- Pfr absorbs mostly Far Red light and very little Red light, but it does absorb some red light too. (about 15% red light absorbed).
- Pr absorbs mostly Red light and absorbs very little Far Red light (only about 3% Far red light absorbed)
Being that this process is reliant on "how much" Red light is present, I don't know if the QB18 would work for this "boosting effect" as it has quite a bit of red light, which I believe may counter the Pfr to Pr conversion and not allow the plant to "sleep" to allow for the conversion to take place until dark. It may work, but the science shows that most likely you would need to use much more Far Red, with either No red, or very little red for this to work.
- This is why long interrupted nights (ex. 12/12 schedule) causes plants to flower because it fully converts the Pfr to Pr, where 18/6 they will not flower (exception of autoflowers) as the night is not long enough to convert all the Pfr to Pr.. The process of night conversion of the Pfr to Pr takes a long time so a long night is needed.
- When you use Far Red light after "lights out" this speeds up the conversion much quicker (technically you could flower using a longer daytime schedule if using Far red at night).
Hope this helps.
Sorry Shiggity!!! didn't mean to jump in on your journal. Miss ya my friend!!! Hope you come back soon to grace us with your presence![]()
I use 1750K along with 3K - the 1750k has a fair amount of far red.
The ratio I've been using is 2:1 3K to 1750K COBs.
I get stretch when the plants genetics are there for big plants. Not all plants do this under the same exact conditions as the plants that get large.
I run my red/far red lamps same time frame as everything else 11.5 lights on to 12.5 lights off. I don't close my room up so these days there's some very small amount of early morning and late evening light in the room. That would be all far red I believe.
Plants do not seem to mind.. they actually prefer the 1750K lamps and will grow right into them if I let them.
I use 1750K along with 3K - the 1750k has a fair amount of far red.
The ratio I've been using is 2:1 3K to 1750K COBs.
I get stretch when the plants genetics are there for big plants. Not all plants do this under the same exact conditions as the plants that get large.
I run my red/far red lamps same time frame as everything else 11.5 lights on to 12.5 lights off. I don't close my room up so these days there's some very small amount of early morning and late evening light in the room. That would be all far red I believe.
Plants do not seem to mind.. they actually prefer the 1750K lamps and will grow right into them if I let them.