All COB Users - Lettuce Grow Challenge!!

Olive Drab Green

Olive Drab Green

Well-Known Member
RyGon said:
Probably, but some people have had problems growing lettuce with white COBs so I think it's worthwhile to do a run with each. I'm guessing there will at least be some differences. Maybe more or less color in the lettuce and I am growing a red leaf romaine and a green leaf lettuce. I think it will be interesting either way.

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It's ready to go with its own boost converter.
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That thing is Frankenstein swag. Did you build it?
 
Olive Drab Green

Olive Drab Green

Well-Known Member
RyGon said:
Oh cool, thanks. I have a hard time understanding if these descriptions are complimentary or not, lol.
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I mean, I dunno what it will yield and hope it does well for you, so I can't comment good or bad, but I think it's kind of cool and important that you were self-sufficient. It looks like you added a Raspberry Pi or Arduino to it. I don't have the interest in learning programming, but my brother's been hacking since 6th grade and wiring electrical shit since he was 4. I have more interest in history, psychology, philosophy, pharmacology, languages, and other biological or social sciences.
 
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RyGon

Member
Olive Drab Green said:
I mean, I dunno what it will yield and hope it does well for you, so I can't comment good or bad, but I think it's kind of cool and important that you were self-sufficient. It looks like you added a Raspberry Pi or Arduino to it. I don't have the interest in learning programming, but my brother's been hacking since 6th grade and wiring electrical shit since he was 4. I have more interest in history, psychology, philosophy, pharmacology, languages, and other biological or social sciences.
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I've got a raspberry pie and an Arduino board, but that board on the light is just a boost converter since I used a 12V power supply I already had laying around. Probably not very efficient, but kinda cool, I can adjust the voltage and amperage with it though, and I have the 3rd COB on a separate boost converter so I can adjust them separately if I want. I built a 3d printer so I have extras of these things.
 
Olive Drab Green

Olive Drab Green

Well-Known Member
RyGon said:
I've got a raspberry pie and an Arduino board, but that board on the light is just a boost converter since I used a 12V power supply I already had laying around. Probably not very efficient, but kinda cool, I can adjust the voltage and amperage with it though, and I have the 3rd COB on a separate boost converter so I can adjust them separately if I want. I built a 3d printer so I have extras of these things.
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Very cool.
 
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RyGon

Member
Oh, and coding seems like some kinda hell to me. Not interested, and biology never interested me much in school but hydroponics is fascinating and has so many interesting rabbit holes to go down like LEDs. As a suburban dad in a restricted state, growing cannabis isn't really sensible for me so high quality fresh herbs and lettuce keeps my wife from hating another one of my projects. My education is in fine arts really, but I just like making stuff. I also have a taste for philosophy like you, but since you also list social sciences you might not agree with a neo-platonic individualistic idealist like me ;) I do enjoy some Jung though. Nice signature.
 
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RyGon

Member
Sunday lettuce update: greenhouse conditions, sunlight + 4000k COBs @ 20000lux, 12h lighting period, left - Grand Rapids (green leaf lettuce) right - Rouge de Hiver (red romaine)
Middle row was moved into the DWC today (11/20) and are day 14 from seed.
Bottom row is day 28.
 

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OLD MOTHER SATIVA

OLD MOTHER SATIVA

Well-Known Member
"Our findings suggest that adding far-red light to lighting sources containing little or no far-red can improve the efficiency of photosynthetic lighting over a wide range of light intensities."
 
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RyGon

Member
Sunday lettuce update: greenhouse conditions, sunlight + 4000k COBs @ 20000lux, 12h lighting period, left - Grand Rapids (green leaf lettuce) right - Rouge de Hiver (red romaine)
Middle row was moved into the DWC today (11/27) and are day 14 from seed.
Bottom row is day 21.
Lower left/upper right are day 35.

I have noticed that while the romaine has red coloring after being under the CFL as seedlings, after a week in the DWC they lose nearly all red pigmentation. They are under the CFL 24 hours per day so maybe DLI is the factor. Maybe I could find the optimum levels if I adjust the lights to the point that both the red romaine and green leaf have proper pigmentation.

edit: I am going to go ahead and push it up to a 14 hour lighting period. Also, maybe supplement the nitrogen a bit.
 

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Evil-Mobo

Evil-Mobo

Well-Known Member
I would have to look back through this thread and see brother don't remember off the top of my head and it's a pain on the mobile lol will check it later on and edit my post.
 
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RyGon

Member
Evil-Mobo said:
I would have to look back through this thread and see brother don't remember off the top of my head and it's a pain on the mobile lol will check it later on and edit my post.
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Don't worry about it. Looks like you germinated on Oct. 21st so that would put it somewhere around 40 days. That sounds like it's doing pretty good to me.

I'd give it another week measure it and eat.
 
muleface

muleface

Well-Known Member
so what do you suppose would be needed to grow lettuce in a 2x4 spot? what would be ideal? 6500k lights? something else? how many watts? Im looking to scale this out pretty big. say maybe 25 bins.
 
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