Opinions on how to light a 10x10 flower room Quantum, COB or Both?

sallygram

Well-Known Member
SO I have been playing around with COBs and pretty much read a library of threads, watched all of Growmau5 videos and talked to a few growers about all kinds of lights and I am ready to start switching my flower room over. BUT... I seem to have backtracked a little bit and now am being swayed towards QBs again.

The Space:
A basement that has reflective walls, Usually it stays in the low to mid 60's even on the hottest days, there is a window AC unit in it that was able to keep the room at 75 degrees when I was running 4k of HPS. I would like to limit my power consumption to about 4000 watts for that room. I do not like running the air and would like to dedicate all my power to lights and fans.

My Style:
I like growing 4 foot tall plants vertical in 5 gal buckets, however I have done SCROG and Suppercropping with top grows and have no problem switching my methods. I grow mostly in coir but have been doing some in fogponics. I have pretty good growing skills and have been averaging over 1 GPW with DIY CMH lights.

My skills:
I have built a COB based on the RapidLed 3 Cree kit, I have built a few CMH lights I pretty much have the confidence that I can make anything work (it may not be pretty but it will work and be safe.

My Budget:
My intention is to switch the room over to LED by July, replacing old lights and adding new lights as plants finish or as I get money so basically I am poor but willing to spend the money slowly so that this setup last me a few years.

My Concerns:
In this order 1. Power Consumption 2. Quality of bud 3. Quantity 4. Cost of system 5. Lifespan of system

Thank you all.
 

Raging Stalk

Active Member
So 10x10' for a 100ft2 canopy? Will work with that.

100ft2=9.3m2

Let's say you want an average 1k PPFD across your canopy so you will need around 9300ppf from all your light sources.

How you break that up is up to you.

Cobs run at 50w put out around 140ppf each I think and you would need 67 cobs. That's 3350w in light, you should allocate few hundred watts for fans so you would be under 4kw.

Running more cobs at lower wattage will require less wattage to reach the same ppfd goals. Just more upfront cost in cobs.

Under driving cobs will have them last forever barred any other factors.
 

klx

Well-Known Member
Start with 40 veros at ~100W job done. Then as you go through harvests add more cobs, reducing the current, increasing efficiency but drawing the same amount at the wall. Lower upfront cost and then harvests pay for efficiency upgrades.

That's what I would do with 100 square foot.
 

CobKits

Well-Known Member
Efficiency? Is that not the whole reason we enjoy them is the higher efficiency levels? Even though most are still buying less than 50% efficient kits..
thats one reason. spectrum, lumen maintenance, modularity, etc are also all reasons.

i was speaking specifically to "Under driving cobs will have them last forever". they already will basically last "forever" for our purposes, its up to the user whether "forever and a day" is justified.

also there are no shortage of cobs that are still more efficient than HID at 150+W per cob. its all relative.
 

sixstring2112

Well-Known Member
It was meant as sarcasm.

As a vendor selling cobs he should be happy when someone suggests to buy more.

On the flip side, he loses out on heat sink sales. But the goal should be to never use heat sinks.
Yeah man im just playin,you made me look up that word so i just had to use it in a sentence lol
 

doz

Well-Known Member
thats one reason. spectrum, lumen maintenance, modularity, etc are also all reasons.

i was speaking specifically to "Under driving cobs will have them last forever". they already will basically last "forever" for our purposes, its up to the user whether "forever and a day" is justified.

also there are no shortage of cobs that are still more efficient than HID at 150+W per cob. its all relative.
Yeah, but when you are pricing up a 1000w DE vs. 800w of slightly more efficient cobs, I will take a DE. So many fixtures being sold at 45-49% (and kits) and IMO, that is a complete waste this day in age. A couple years ago sure, that was acceptable, but not with current tech but people continue to pay for it....
 

CobKits

Well-Known Member
It was meant as sarcasm.

As a vendor selling cobs he should be happy when someone suggests to buy more.

On the flip side, he loses out on heat sink sales. But the goal should be to never use heat sinks.
im not overly concerned whether somebody uses 1 or 10 cobs or quantums or CMHs whatever, as long as they are happy and productive. we'll never overgrow anything without a team attitude!
 

CobKits

Well-Known Member
Yeah, but when you are pricing up a 1000w DE vs. 800w of slightly more efficient cobs, I will take a DE. So many fixtures being sold at 45-49% (and kits) and IMO, that is a complete waste this day in age. A couple years ago sure, that was acceptable, but not with current tech but people continue to pay for it....
Nothing wrong at all with people getting into cob builds at $0.50/watt or less.... again efficiency is only one factor.they dont need to be the most efficient to be viable.

and you highlighted another great cob attribute..... versatility

the same chip can literally cover an order of magnitude of power and span the entire spectrum from efficiency to economy, allowing the users to find their spot on the spectrum
 

sallygram

Well-Known Member
25 quantum boards would light up that spot like the sun each board covering 4 sq ft :)
I thought about that at about 150 watts each, 2 per driver, but at looking at cobkits.com he has an emitter called a Luminus CXM (I am still researching it) so I am even more torn...I am thinking about doing a 2 board and a 2 cob CXM and running them side by side to see what to go with. I am still looking at other setups I just hope that the day I start this DIY some new tech doesn't come out...
 

Joe34

Active Member
If you average over 1GPW, I have seen multiple threads now of users running COBS getting 1.35-1.8 GPW+.

Perhaps look at some Citi/Vero Chips. If cost is a concern, go with the Citizens, latest 6th gen 1212.s are going for around $11 each compared to latest Vero 29 at $25...

Going with both QB and COBS is likely to just make the grow room more complicated....

Also arnt those QB a large fixed size? if so would'nt that make the COB a better choice for more light uniformity and scaleable design.
 

doz

Well-Known Member
Nothing wrong at all with people getting into cob builds at $0.50/watt or less.... again efficiency is only one factor.they dont need to be the most efficient to be viable.

and you highlighted another great cob attribute..... versatility

the same chip can literally cover an order of magnitude of power and span the entire spectrum from efficiency to economy, allowing the users to find their spot on the spectrum
Where are you getting $0.50/watt or less from? You cannot touch cobs for that. 200w of COB lighting for $100? If it was that cheap, no one would EVER consider DE/CMH. From what I am seeing, unless you are a direct supplier, you are looking at about $1.20/w best case DIY (and thats not your fancy pin cushion heatsinks that everyone loves).
 
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