I switched from High Pressure Sodium to COBs. My experience

[Carraxe]

Come on, guys, I thought I was able to make myself clear but clearly I am not!

You can have first quality harvests with both Sodium and LEDs, that's clear. That's not the debate.

But, that said, the differences between a 3500ºK Cree/Citizen COB setup and a High Pressure Sodium are that enormous, it is soooo easy to see the different effect of the different light spectrums on the plants, that if you come here and state that they are just the same, you are just plain wrong.

If you didn't notice any difference in your plant growth, bud formation and structure, between Sodium and COBs, then there is no way you can contribute to the objective of this thread. The differences are easy to spot. I've been growing and flowering with COBs for years.

Thanks for your collaboration

 

[Koondense]

I can't say anything for the hps buds but after three clone runs under the same cobs(3000k cxb) i had three different bud densities. So i thought it's probably related more to temperatures, vpd and nutrient absorption, probably hps radiant heat also plays a role in the bud density and other measurable details.


Cheers

 

[Carraxe]

I can't say anything for the hps buds but after three clone runs under the same cobs(3000k cxb) i had three different bud densities. So i thought it's probably related more to temperatures, vpd and nutrient absorption, probably hps radiant heat also plays a role in the bud density and other measurable details.


Cheers

Nice. That's the thing, narrow the search to these measurable details that can affect the grow. I still believe there is something there we didn't put the finger on yet...

 

[Ichabod Crane]

Are you saying you trim the sugar leaves in the colas as it grows? That sounds interesting.

No I leave the leaves that grow in flower.

What I do is remove all bud sites leaving only one at the tip of a branch. When I remove the bud sites I leave the fan that is there to feed the tip bud site.

By doing this it makes for larger buds which are denser and easier to trim. Here is a picture to demonstrate what I mean. The cola on the left I left several bud sites at the tip of the branch. The one on the right I left one bud site. This is the same plant.

You choose which one is faster to trim come flower. It is kind of a intense trim job but it is the only time I remove leaves.. That is until the last week when I am taking fans to speed up harvest.

 

[indagroove]

No I leave the leaves that grow in flower.

What I do is remove all bud sites leaving only one at the tip of a branch. When I remove the bud sites I leave the fan that is there to feed the tip bud site.

By doing this it makes for larger buds which are denser and easier to trim. Here is a picture to demonstrate what I mean. The cola on the right I left several bud sites at the tip of the branch. The one on the left I left one bud site. This is the same plant.

You choose which one is faster to trim come flower. It is kind of a intense trim job but it is the only time I remove leaves.. That is until the last week when I am taking fans to speed up harvest.

[URL=https://www.icmag.com/ic/picture.php?albumid=78759&pictureid=1918926]View Image[/url]

Are you sure you don't have your right/left mixed up?

 

[Ichabod Crane]

Haha yes I do I will fix it. I cant see the picture till I post it.

 

[TychoMonolyth]

The difference is very obvious. Thanks.

 

[Weird]

having used hps, led cob, cmh and de together and mixed I am still not ready to go all led

 

[Carraxe]

I can't say anything for the hps buds but after three clone runs under the same cobs(3000k cxb) i had three different bud densities. So i thought it's probably related more to temperatures, vpd and nutrient absorption, probably hps radiant heat also plays a role in the bud density and other measurable details.


Cheers

I grow many plants from different strains and I'm certain about what I say. Can the plants be affected by different temperatures? Of course, I plant all around the year, with temperature peaks in summer and very low temps in winter. But my results, having that into account, are still consistent, .

I believe that there is more into the spectrum, other than this red/blue ratio that has been trending topic for years. Don't know if it is the far red, the amount of oranges or greens or yellow or anything, but I see differences in bud formation under LEDs that sometimes (sometimes, and with just some strains) favor HPS.

How does it affect? COBs don't affect the amount of bud, all the contrary, but with certain strains, specially sativas or sativa leaning plants, the compactness of the bud is somehow reduced.

Let's see if we get some more wisdom from some of the wise users. If not, this will be nothing but speculation.

Cheers

 

[Carraxe]

having used hps, led cob, cmh and de together and mixed I am still not ready to go all led

Why not?

 

[Weird]

I still like the results of mixed spectrum and the penetration of other techs

 

[ESTERCHASER]

dude i use screws in leds, and hps along with window supplimental sunlight.

 

[Koondense]

Consider the fact that practically all indoor cannabis from past years was selected when flowered under hps...


Cheers

 

[RB56]

I think 15° is too low. I switched to LED during winter and ran into the same problem - slow growth at about 15°. Increased it to 21° and the problem was solved. I added a space heater with a thermostat on its lowest power setting. Advantage over adding hot lights is keeping lights out temps up.

 

[Weird]

Consider the fact that practically all indoor cannabis from past years was selected when flowered under hps...


Cheers

lol I still have stuff selected from generation underneath 430 agrosuns



some of that late 80s early 90s dutch stuff really shined under 400

 

[TheDarkStorm]

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Differences in night an day temperature can alter the density of the bud as can not having it completely dark eg some people have little led program display panels on ther led lights some of which stay on wen the main light goes off, or tents with loads ov light leaks.

 

[Carraxe]

I got some of my best buds in winter. It is fresh and I can have a lot of power. Also, after that many years of experience, I can say that all the strains that I grow indoors really shine outdoors. These are not enough reasons.



Cheers

 

[Shmavis]

I agree. The differences between HID and LED plants are significant.

As others have suggested, I have found higher temps/humidity to make a big difference. I have a PLC-420 3500K COB panel. One grow with it in an open room alongside a 600w HPS - good performance (extra heat from HPS and CO2 generator). In the open room on its own, twice, with mixed results. Because of a lack of space I set up a tent in a much bigger room. I focused on keeping temps and humidity high. In this room though, I had less control over nighttime temps. And no CO2 supplementation. Day to night temp swings were often +15º. Had my best run yet under the panel.

Dense, and not leafy:

I currently have a few plants under this panel. Early on as seedlings I kept temps and humidity more in line with HID grown plants. Within a couple days of cranking up the temp and humidity they really took off. So a need for higher temps/humidity is a noted aspect in my early LED experiences.

I also have an HLG 550-V2 3000K. Have yet to focus on higher temps/humidity with it but plan to soon. First couple grows under it have not gone so well.

 

[growshopfrank]

Are you saying you trim the sugar leaves in the colas as it grows? That sounds interesting.

Quite a kettle o fish there
https://www.icmag.com/ic/showthread.php?t=174163

 

[TychoMonolyth]

Thanks for the link frank. I'm going to try that on a backyard plant this summer. Should be a fun experiment.