Light LEVEL UP for my small tent

Jimdamick

Jimdamick

Well-Known Member
Kassiopeija said:
In veg you can give longer light and therefore can satisfy to reach the DLI with a lower amount of watts....
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Yes, that's right, but LED's are relatively low cost to run anyway, so I would personally opt for the higher lumens for a more vibrant plant.
Plants love light, so if it costs an extra $5 a week for an optimum grow, take my money, it's worth it too me
 
Kassiopeija

Kassiopeija

Well-Known Member
Jimdamick said:
Yes, that's right, but LED's are relatively low cost to run anyway, so I would personally opt for the higher lumens for a more vibrant plant.
Plants love light, so if it costs an extra $5 a week for an optimum grow, take my money, it's worth it too me
Click to expand...
indeed, make the plant right away used to some increased light-levels, plus it's not really that much light, isn't it?
 
Jimdamick

Jimdamick

Well-Known Member
Kassiopeija said:
indeed, make the plant right away used to some increased light-levels, plus it's not really that much light, isn't it?
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Light levels can also be adjusted by just moving the light higher.
I start my seedlings with a T5 36 watt each (6 bulbs) fluorescent fixture at a height of around 12" above canopy & then raise the light as they grow
I run a fan thru the plants to keep temps down, but at around 4 weeks they are 4" under the lamps & loving it :)

IMG_20190412_145923905_HDR.jpg
 
coreywebster

coreywebster

Well-Known Member
Jimdamick said:
Why would you want too dim an LED?
I don't understand that at all.
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Because its 100w light and 40% more than he needs which in flower wouldn't be a problem if he had a bit more height.
In veg it will be a problem, he will get light stress.

His space is 120cm high and if it were around 60w it would need to be 30-45cm above his plants. That's already taking up a lot of his head room, at 100w without dimming it needs to be further away.

I know with bulbs you can say the more light the faster the growth but it doesn't work with LEDs. You end up with a plant that gets light stress and looks like it has every deficiency there is. The plant just cant keep up, especially in veg , with longer hours of light and the spectrum and intensity the DLI fills fast and without manipulating every aspect of the grow to allow for it light stress is very likely.
 
L

Leonida

Well-Known Member
Guys as usual thanks a lot for all the suggestion! I'm a bit overwhelmed now!

I think I can position the light at the top obviously which would mean 110 cm from the bottom, and I'm willing to grow plants that dont go over 60/70 cm...

Do u think this light i just purchased is right?

I'm still in time to delete the order today if u think it would not be optimal for my current solution please let me know. I don't like the idea of spending 130 euro for something that will kill my plant for light stress.

I'm looking into getting a bigger tent but no way this is going to happen any soon and not sure it is going to happen at all, there may be no chance to fit something bigger than 40x40x120cm.

Agree with all u said but better 1 plant than 0 plants for the moment
 
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Moflow

Moflow

Well-Known Member
In old money you have 48" of height.
Less height of pot ~ 10" leaves you with ~38" height. Find a pot that'll fill the area, around 14" x 14" - tote box etc.
Less Max height of plant to light ~ 12" = 26" plant. Scrog plant to fill the area and keep it short.
The seedling will be ok lightwise with the light at top of tent.
Vegging at around 20" away for 18hrs at 400 umols/s/m2 gives a DLI of ~ 25
Full flowering at 12 - 14" away for 12hrs at 800 umols/s/m2 gives a DLI ~ 35
 
Moflow

Moflow

Well-Known Member
Either the Mars or you could make a DIY light with 1ft strips and a Meanwell dimmable driver.
1ft Samsung F strips

SI-B8U261280WW Samsung Semiconductor, Inc. | Optoelectronics | DigiKey

Order today, ships today. SI-B8U261280WW – LED Lighting COBs Engines Modules LED Module series White, Warm Linear Light Strip from Samsung Semiconductor, Inc.. Pricing and Availability on millions of electronic components from Digi-Key Electronics.
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Driver

That'll give you ~ 80 watts max and it's dimmable to around 40 watts
 
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L

Leonida

Well-Known Member
Okay I thinki can keep it at 20" from the plant ( lower pot and LST will help)

Thanks a lot for all the info and the DIY solution, I ll consider but better go with a built in solution for now.

Not really sure I'm following when u say:
Vegging at around 20" away for 18hrs at 400 umols/s/m2 gives a DLI of ~ 25
Full flowering at 12 - 14" away for 12hrs at 800 umols/s/m2 gives a DLI ~ 35

At 400 or 800 umols/s/M2? What does it mean? Should I change any setting on the light?

Really sorry if my questions sound stupid but the learning curve is just at the beginning!
 
Moflow

Moflow

Well-Known Member
Leonida said:
Not really sure I'm following when u say:
Vegging at around 20" away for 18hrs at 400 umols/s/m2 gives a DLI of ~ 25
Full flowering at 12 - 14" away for 12hrs at 800 umols/s/m2 gives a DLI ~ 35
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Using the MH TS600 PAR Maps for reference.
I would veg the plant with that fixture at approximately 20 inches away for a period of 18hrs of light, 6hrs of darkness.
In Flower 12- 14 inches away, 12hrs on 12 hrs off.
That's what I do anyway.......

Don't be worrying about the DLI - Daily Light Integeral
Where PPFD expresses light intensity in a second, DLI expresses the sum of those measurements in a 24 hour period (86,400 seconds per 24 hours).
Just I noticed DLI mentioned previously In the thread so I calculated the DLI from the par map of the Mars light.
Here's a handy DLI calculator for any nerds interested ....;)

Daily Light Integral (DLI) Calculator | Waveform Lighting

With a PPFD input value and total hours of use per day, Daily Light Integral (DLI) values can be calculated using our online calculator.
www.waveformlighting.com www.waveformlighting.com

Waveform also have some other decent calculators too.
Lux to par, lumens to ppf, etc
 
L

Leonida

Well-Known Member
@Moflow I really really appreciated all your suggestion and the details, I guess I got it all to proceed now!

The light it's on the way, can't wait to test it, not sure if i should switch the CFL with the LED new one for this plant though...

I'm going around with the measuring tape to check if by any chance i can fit anything bigger than what I've but honestly don't see any way..

I was also reading around that seems to be possible to grow in a 40x40x120cm room 2 plants if I limit it using a pot of 3.5L (2 gallons), maybe after this baby i can try with this approach and see if it gets better, so if i mess up one plant, at least there is the second one... What you guys think?
 
Jimdamick

Jimdamick

Well-Known Member
Leonida said:
I was also reading around that seems to be possible to grow in a 40x40x120cm room 2 plants if I limit it using a pot of 3.5L (2 gallons),
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You'll be able too fit 3-3 gallon pots in that area.
Don't use 2 gallon pots for pot plants, plus I'm not sure you can actually find them.
1 gallon per month of grow is a standard for marijuana, so for a 4 week veg & 8 week bloom, a 3 gallon is perfect.
Just jam the fuckers in there & with some training & pruning all will be good :)
Good luck :)
 
L

Leonida

Well-Known Member
Jimdamick said:
You'll be able too fit 3-3 gallon pots in that area.
Don't use 2 gallon pots for pot plants, plus I'm not sure you can actually find them.
1 gallon per month of grow is a standard for marijuana, so for a 4 week veg & 8 week bloom, a 3 gallon is perfect.
Just jam the fuckers in there & with some training & pruning all will be good :)
Good luck :)
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mmhhh... what dimensions are you thinking about?
Cause all the three gallon that i found are >20cm of diameter, which means i cannot fit in them, i mean at least not more than two!

eg:
3 Gallon Size: Approx. 23 x 20cm /9.06 x 7.87inch
3 Gal Dimension: Top: 11.5 inch; Bottom: 9 inch; Height: 9.625 inch

Are you thinking a specific shape? or maybe you mean fabric ones?
 
Jimdamick

Jimdamick

Well-Known Member
Leonida said:
mmhhh... what dimensions are you thinking about?
Cause all the three gallon that i found are >20cm of diameter, which means i cannot fit in them, i mean at least not more than two!

eg:
3 Gallon Size: Approx. 23 x 20cm /9.06 x 7.87inch
3 Gal Dimension: Top: 11.5 inch; Bottom: 9 inch; Height: 9.625 inch

Are you thinking a specific shape? or maybe you mean fabric ones?
Click to expand...

1593539401931.png

These will work nicely :)
 
L

Leonida

Well-Known Member
Jimdamick said:

View attachment 4610097

These will work nicely :)
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Thanks @Jimdamick, they are "3 GAL Fabric Pot: 10" x 9" (25cm x 25cm)" but the greenhouse is 40cm x 40cm, how can i fit them? You mean cause they are flexible being made of fabric so i can swash them in? Just double checking before purchase them ;)
 
Jimdamick

Jimdamick

Well-Known Member
Leonida said:
Thanks @Jimdamick, they are "3 GAL Fabric Pot: 10" x 9" (25cm x 25cm)" but the greenhouse is 40cm x 40cm, how can i fit them? You mean cause they are flexible being made of fabric so i can swash them in? Just double checking before purchase them ;)
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I use inches where I live in the US & I just did a conversion.
Your tent isn't even 16" wide?
You, my friend are fucked, simply put.
I didn't know they actually made something that small.
Way too small a tent & I wouldn't waste my time with it.
A single plant is larger than that even if you prune the fuck out of it.
Where do you live & why does it have too be so small?
Also, your saying it's going into an attic?
Attics get way hot in the summer, did you take that into consideration.
 
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