Lighting 3x3 setup

[Beardo]

Hi Guys, I'm new here so go gentle on me.

I'm in the midst of setting up a small tent setup of something around 3x3x1.5, very limited by the space I have to stealth grow.

I initially bought 1 60w 3500k plug&play Cob light, then had some extra funds and purchased a second thinking that'd probably be enough light for the space I'll have, but now I'm questioning myself that it'll be enough light for the 2 autos I plan on growing. My thought was to add two other Cobs, but of 100w each, giving me a total of 320w.
My question is 2 part, is this enough light to give a good yield? and is hanging 4 individual Cobs a good idea?

Cheers guys [emoji106]

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[davisgirl]

What’d you get for cobs? My cobs run 65 watts and I run a cob a plant generally. You may be fine with 2. Is your space 18” high?

 

[Beardo]

It'll be a maximum height of 1.5m but growing dwarf autos I'll only require 1m which allows room for the cobs and the fan/filter.
Coming from growing under 400w hps, led's are a whole new thing to me.


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[Death The Cultivator]

It'll be a maximum height of 1.5m but growing dwarf autos I'll only require 1m which allows room for the cobs and the fan/filter.
Coming from growing under 400w hps, led's are a whole new thing to me.


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Are they full spectrum or blurples? What is the name? 3x3 would amount to 270 watts for flowering.

CobsCocoDTWMxPScrog Watch Me Mess Up

 

[Proph]

Two cobs at 65w a piece should be enough light for two plants. I wouldn't worry to much about yield just yet, especially if youre growing dwarf autos. For single cobs, the general rule seems to be 1 plant per cob. 2 cobs per plant feels like over kill for dwarf autos. If you were trying to grow big ole bushes, two cobs per plant would be better, but for what you described, 2 cobs and 2 plants should be more than fine!

 

[Beardo]

They're Citizen CLU048 1212 Gen 6 COBs in 3500k, 155 Lumens Per Watt, Max Output Rating 117W, 36 Volt DC, ( safe low DC voltage
I don't know whether it's allowed ,but they're item number 303068089660 on that certain auction site . Made by a guy over here in the UK.

Do do you think that 2 cobs would actually suffice for the tent size(2 plants)?

Really appreciate all your feedback [emoji106]

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[Death The Cultivator]

They're Citizen CLU048 1212 Gen 6 COBs in 3500k, 155 Lumens Per Watt, Max Output Rating 117W, 36 Volt DC, ( safe low DC voltage
I don't know whether it's allowed ,but they're item number 303068089660 on that certain auction site . Made by a guy over here in the UK.

Do do you think that 2 cobs would actually suffice for the tent size(2 plants)?

Really appreciate all your feedback [emoji106]

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Maybe @BigSm0 can help as I'm not familiar with cobs to that extent

CobsCocoDTWMxPScrog Watch Me Mess Up

 

[BigSm0]

The biggest thing to remember is wattage doesn’t mean light.

It’s hard not to fall for the inflated wattage multipliers these companies claim. On eBay you can find one of these 1800 watt lights then multiply the wall wattage by .2 That’s the amount of light you get. We may think 100 cob watts isn’t enough but for some reason 1800 is. I know this isn’t an answer to your question but it’s a good start in understanding the difference.

 

[Beardo]

Thanks for the replies. Thankfully before I dump a load of money on any things I buy, I always research, a ton.
I'm probably going to upgrade the tent size to a 1.2 x 1.2 x 1.8m Green Qube attic tent.
I already now have the two 60w Cobs but will get another one and run 3 lights over 3 plants and just lst them to keep them short.
Probably going to stick a 6" fan/filter kit in there too, so the extra roof height will allow for all the items hanging down.

I can't plant until the 2nd week of may due to upcoming holidays so I at least have plenty of time to get all the right items together.

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[Black Sail]

In my opinion COBs per plant isn't the best metric to go by, it adds in the variable of plant size. Extra variables = extra confusion. For high quality COBs in the 2.0-2.2umol/J efficiency range, 37.5 Watts per square foot is a tried-and-true rule of thumb for getting the maximum yield from your space. Growmau5 put that guideline out years ago, it's what we used when I worked at Rapid LED and it's 100% confirmed.

So for a 3'x3' space you should have around 337.5 watts of high quality COBs. That will put you in the 800-1000 ppfd range. This is the sweet spot for maximum growth rates and yields, before you reach the point of diminishing returns. Honestly you could get away with a little less than that (around 300 watts should be fine) and still get great yields.

For 3500K 80CRI COBs, 155lm/w will put you in the range of ~2.1umol/J. That means you're doing great with the Citizen Gen 6 1212's. Along with efficiency, the actual wattage draw at the wall and the cost in dollars per watt are the most important factors when buying a growlight. I made a 5 question, fill-in-the-blank LED Buyer's Guide that breaks down all the important questions, how to ask them, and let's you compare any LED growlight in 5 minutes. Here's the link to it on AFN. I hope that helps:smoking:

-Keith