How many COB watts for each plant please?

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Fevs

Well-Known Member
So cobs are way more efficient than hid lighting. How many watts per square foot do I need for flowering with 50w cob leds?

Also how many ideally over each plant. Give you a rough idea. 4ft x 4ft area, 4 plants.

Do you reckon 400w would cover that nicely? 100w over each plant?

Maybe 800w total, 200w over each plant?

Cob growers, please fill me in with this info, I'm about to pull the trigger on cobs, but am no yet certain of which to get.

The units I'm looking at are either 102w (2 cobs), 204w (4 cobs), 306w (6 cobs), 459w (9 cobs)

Looking forward to hearing any info/knowledge any of you guys and girls have. Thanks
 
F

Fevs

Well-Known Member
Airwalker16 said:
A good rule of thumb is a MINIMUM of 30W per sq ft in flower. So with 16sq ft, 500watts would be decent. If you can afford/handle 800 watts in your 4x4, by all means, do it.
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Brilliant. Thanks airwalker. Seen some decent very useful posts from you helping ''about to go cob'ers'' (:

Thanks a lot buddy!
 
Tigerpaws

Tigerpaws

Well-Known Member
Airwalker16 said:
A good rule of thumb is a MINIMUM of 30W per sq ft in flower. So with 16sq ft, 500watts would be decent. If you can afford/handle 800 watts in your 4x4, by all means, do it.
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So would this be one 30 watt COB per sq foot then? I have these three 300 watt LEDs spaces 2 ft. apart and was wondering if adding a couple COBs in between would be beneficial? I'm also wondering if some COB side lights would be good?
 

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Roger A. Shrubber

Roger A. Shrubber

Well-Known Member
30 watts is the minimum required for vigorous growth. for most strains, saturation comes at 50 watts per sq foot, you can put more on them but they won't be able to absorb much more than that. seems like a dimmable 50 per sq foot would be perfect, as you could turn them down to about 25% for seedlings and clones, then turn them up to 50-60% for veg, then turn them on full for flower
 
Tigerpaws

Tigerpaws

Well-Known Member
Roger A. Shrubber said:
30 watts is the minimum required for vigorous growth. for most strains, saturation comes at 50 watts per sq foot, you can put more on them but they won't be able to absorb much more than that. seems like a dimmable 50 per sq foot would be perfect, as you could turn them down to about 25% for seedlings and clones, then turn them up to 50-60% for veg, then turn them on full for flower
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Would you recommended putting say a 3 COB panel in between the LEDs I already have then? The room is only 4ft wide and part of that is my access space. The pic is of the room before I put up the door and drywall. I also added a 3rd LED. They are on 2' centers.
 

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Tigerpaws

Tigerpaws

Well-Known Member
Thanks Fevs! I plan on doing a flood and drain in there. I built this narrow table to go the length of the room. Now I'd like to build some COB panels to go with the 3 LEDs I have in there but I'm so confused on how to do it and where to start. I've watched videos and read through the forums but for my application I don't know what to buy or how I should design it. I'm very mechanically inclined but electricity and watts and par and all that mumbo jumbo is not my thing. Lol
 

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Tigerpaws

Tigerpaws

Well-Known Member
Roger A. Shrubber said:
if you can afford it, i'd put those you already have horizontal around the walls, and hang some cobs overhead, have a led/vertical grow
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Horizontal or vertical?
I would love to do that I just have no idea what to buy for the COBs. If someone could give me a material list and a little illustration, I would love them forever! Lol
 
F

Fevs

Well-Known Member
I'm going to buy pre made cobs from Budmaster in the UK

I read a thread earlier where some dude made his own and made them up, then turned it on, the one started smoking. Poor bastard :lol:
 
1

1-2Learn

Active Member
Fevs said:
So cobs are way more efficient than hid lighting. How many watts per square foot do I need for flowering with 50w cob leds?

Also how many ideally over each plant. Give you a rough idea. 4ft x 4ft area, 4 plants.

Do you reckon 400w would cover that nicely? 100w over each plant?

Maybe 800w total, 200w over each plant?

Cob growers, please fill me in with this info, I'm about to pull the trigger on cobs, but am no yet certain of which to get.

The units I'm looking at are either 102w (2 cobs), 204w (4 cobs), 306w (6 cobs), 459w (9 cobs)

Looking forward to hearing any info/knowledge any of you guys and girls have. Thanks
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I grow 30 plants with 6 100w cobs, without diffusers or lenses. Supposedly puts out an equivalent to a 1500 hps output.

I have a 9x12 room with 15 plants on either side. 3ft grow area, 3ft lane, 3ft grow area. There's a cob hanging every 4ft along the 12ft length on both sides.

I'm drawing 310w from the wall.

Yields are consistently 1.5g per watt.

Happy happy.
 
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1

1-2Learn

Active Member
Tigerpaws said:
Horizontal or vertical?
I would love to do that I just have no idea what to buy for the COBs. If someone could give me a material list and a little illustration, I would love them forever! Lol
Click to expand...
Put those lights in storage and build these.

4 Nukehead 50w 3500k.
1 Nukehead 50w full spectrum.

Hang them in a 2'x2' pattern with the full spectrum in the center. Like 5 on dice.

This will blast any 4x4, 5 pot grow.

Essentially, 1 cob per plant. The full spectrum is not required. All five will grow great without it.

Those Nukehead cobs are solder less and have a built in driver. Plug And Play

directvoltage.com

Nuke Head Solderless LED Grow light 110V AC 50W Driverless Solderless COB/DOB led grow light chip. Blue - Full Spectrum - Warm white - Cold white

Nuke Head 110V AC 50W Driverless Solderless COB/DOB led grow light chip. Blue - Full Spectrum - Warm white - Cold white
directvoltage.com directvoltage.com
 
Renfro

Renfro

Well-Known Member
1-2Learn said:
Put those lights in storage and build these.

4 Nukehead 50w 3500k.
1 Nukehead 50w full spectrum.

Hang them in a 2'x2' pattern with the full spectrum in the center. Like 5 on dice.

This will blast any 4x4, 5 pot grow.

Essentially, 1 cob per plant. The full spectrum is not required. All five will grow great without it.

Those Nukehead cobs are solder less and have a built in driver. Plug And Play

directvoltage.com

Nuke Head Solderless LED Grow light 110V AC 50W Driverless Solderless COB/DOB led grow light chip. Blue - Full Spectrum - Warm white - Cold white

Nuke Head 110V AC 50W Driverless Solderless COB/DOB led grow light chip. Blue - Full Spectrum - Warm white - Cold white
directvoltage.com directvoltage.com
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Let me get this straight, 5x50 watts = 250 watts. 250/16 sqft = 15.6 watts per sqft. That seems like about half the power really required to grow good weed using even the best LED's I have seen. I would wanna be in the 30-356 watts per sqft range.
 
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