Lighting New Light Spec Check...

[Site]

Sorry to post this up but im still getting to grips with what a 'good' amount of light will be when using COB's...a friend has seen my DIY COB setup and wants one made for him...hes converted basically!

He has a 2.0m x 1.0m tent and wants enough COB's to fill the tent...he grows with a SCROG net and veg's photos to get an even canopy...I have drawn out a basic layout of the proposed lights and how I would do it now compared to mine to save on drilling and bolts etc...

He picked up the same Artic 64 GT CPU coolers as me for £3 each already so gonna go with them...he bought 16 to copy my 8 COB light...

The specs will be

16 x Citizen CLU048 1212
2 x Meanwell HLG185-C700 Drivers
16 x Artic 64GT CPU Coolers
16 x COB Holders

Do you all think that 8 No. 1212's at 700mA will provide enough light for a space that big...im running 8 Cree's at 700mA and its doing fine for me and thats on autos that havent been trained to an even canopy...any input would be greatly appreciated!

 

[Ivean]

Sorry can't really offer any advice as I'm still researching ready to build my first cob set up. How are you finding the heat using the pc heatsink ? And what are you using to drive all the fans ?

Sent from my SM-G930F using Tapatalk

 

[Site]

Sorry can't really offer any advice as I'm still researching ready to build my first cob set up. How are you finding the heat using the pc heatsink ? And what are you using to drive all the fans ?

Sent from my SM-G930F using Tapatalk

No worries at all! I used this fan controller on my last build and I wired it into a phone charger i got off ebay...

Amazon product ASIN B006Z8LB6S
http://www.ebay.co.uk/itm/24W-AC-DC...980688?hash=item4884f03790:g:668AAOSw~bFWG4tl

 

[pop22]

Take a look at Big Smo's grow using just 4 cobs that run at 1050ma. Amazing! Low power, high efficiency is where its at! That light will work fine, and more cobs could always be added later if actually needed. Myself, I'd use the HLG-240H-C1050b. per 8 cob string for 55 watts per cob. That small difference in amperage will increase light output by almost 33%! THAT would certainly be a good amount of light! Ad a potentiometer for the dimming circuit and run 1/2 power for early to mid veg, then crank it up!

 

[Site]

That driver will only power 5 cobs at 1050 though wont it? I cant remember the exact spec or voltage output of it now...i thought about 5 cobs at 1050 and that driver but i already have a 185-c700 driver my friend can have so it cuts his costs down a bit

 

[pop22]

Your right, my mistake! You'd have to go up to the 320H to get enough voltage.

 

[thetreeman]

2 square meters is 21 square feet, you are talking about using less than 400 watts for that area, not enough imo. With cobs Id say you want 20w/sq ft minimum. Ideally about 35w sq/ft. which would be 735 watts total. U could do 4 hlg-185h-c1400s or a couple 320h's.

 

[pop22]

Have you seen Big Smo's grow? 4 cobs a a total of 220 watts in 16 sq ft? Don't be too sure its not enough at least in a tent with lots of difused light. The biggest problem with this area is maybe not enough spread. 3 lights with 4 cobs each would cover better IMO. Most of us have a budget to meet also. He could start with this then add a couple autocobs to fill in later. That's were the single cob lights work great, to fill in areas not covered well by a rigid light, you can even spotlight specific plants!

2 square meters is 21 square feet, you are talking about using less than 400 watts for that area, not enough imo. With cobs Id say you want 20w/sq ft minimum. Ideally about 35w sq/ft. which would be 735 watts total. U could do 4 hlg-185h-c1400s or a couple 320h's.

 

[thetreeman]

Consider running 3 of these, https://cobkits.com/product/meanwell-hlg-185h-48a-driver/ with 1812s. No where else to get 660w of HLG power for $120 that I know of. You can push these to 220 watts each using 50v cobs and get an additional 10% off using discount code RIU (I think thats it). Ive got one of these running 4 1818s right now using mechatronics passsive heatsinks and its pretty sweet, lots of power for that price. 3 of those in a tent pushing 12 cobs would be nice, you could even save a few bucks and run them with just 9 cobs at a little less efficiency. Also make sure you get V6 citi cobs, they are a nice boost to gen5... Personally I prefer 3000k or 3500k 90cri based upon the research I have done

 

[Site]

2 square meters is 21 square feet, you are talking about using less than 400 watts for that area, not enough imo. With cobs Id say you want 20w/sq ft minimum. Ideally about 35w sq/ft. which would be 735 watts total. U could do 4 hlg-185h-c1400s or a couple 320h's.

we are planning to just run a 1.6x0.8m scrog net and the rest of the space will just be used for the dehumidifier, CO2 etc...i run 200W on a 0.8x0.8 tent at the moment and its going well....but i think we are gonna up them to 1050mA at the moment just incase we want to expand in the future...

Have you seen Big Smo's grow? 4 cobs a a total of 220 watts in 16 sq ft? Don't be too sure its not enough at least in a tent with lots of difused light. The biggest problem with this area is maybe not enough spread. 3 lights with 4 cobs each would cover better IMO. Most of us have a budget to meet also. He could start with this then add a couple autocobs to fill in later. That's were the single cob lights work great, to fill in areas not covered well by a rigid light, you can even spotlight specific plants!

yea that wattage he has for a 4x4 is amazing! im shocked by the results really but it definitely proves enough...yea i was thinking 2 lights made from 8 cobs would give a very nice spread over it all...3 lights of 5 might even be a good shout even over the proposed 1.6x0.8m scrog net...

Consider running 3 of these, https://cobkits.com/product/meanwell-hlg-185h-48a-driver/ with 1812s. No where else to get 660w of HLG power for $120 that I know of. You can push these to 220 watts each using 50v cobs and get an additional 10% off using discount code RIU (I think thats it). Ive got one of these running 4 1818s right now using mechatronics passsive heatsinks and its pretty sweet, lots of power for that price. 3 of those in a tent pushing 12 cobs would be nice, you could even save a few bucks and run them with just 9 cobs at a little less efficiency. Also make sure you get V6 citi cobs, they are a nice boost to gen5... Personally I prefer 3000k or 3500k 90cri based upon the research I have done

i did think about using 5 1818's run at like 1050mA or something rather than more 1212's but for me its getting hold of them which is difficult...i will take a look at that driver and work out if it will do the job and if the are available to him in the uk