2nd Build-DIY COB with Vero 29's x 6

[Roasty McToasty]

I would do 4 vero 29's at 1400mA and make sure to get a dimmable driver. You'll need at least 1 foot clearance above canopy unless you can dim it down. I haven't gone over 130w with my 3 veros at 1 foot away. So if you have the height you can run more, but it's more efficient to drive at lower currents.
I'd run 4 cobs on a hlg-240h-c1400b and space them about 8 to 12 inches apart in a str8 line. Don't use the pico EZ-mate if putting 4 cobs on 1 driver as you'll exceed the max voltage of the EZ-mate's. You'll have to solder your wires to the chips. Passive cooling is the best route, but spendy. I use arctic 64+ and drive the pc fans with a Mean Well apv-12-12, up to 4 fans wired in parallel.

 

[Arf]

36x20x62"
currently have a 400 watt hps

You can run 4 down the middle, 4 x (9" x"20") rectangles but it would mean one axis gets way more light than the other, not so even.

However, if you divide your space into 6 x (12" x 10") rectangles and stick a COB in the center of each it's a pretty easy to visualize spread wise without factoring in wall reflections etc.

So I would do 6 x Vero29 (2 rows of 3), running off two drivers, probably the dimmable 1400mA ones Roasty suggested, and dim them down to about 1,000mA (36W each COB) you should get a better yield than the 400HPS with noticeably less power consumption.

 

[Roasty McToasty]

Nice suggestions Arf! That would be a much more efficient and more even coverage. Definatly yield better. Then you could also use the Pico EZ-mate's, glad I used them. I enjoy your posts Arf, I learn a lot from you.

 

[Roasty McToasty]

To save a few bucks on drivers you could almost max out this driver with six vero 29's. Near 320w max, but you'd want to dim her down to ~1050 mA like Arf recommended.

 

[cultivatorkid]

i see at the start of this thread you used the 2100ma. was it hard to cool? or any other drawbacks besides efficiency? i am going to put the drivers outside the tent. i already purchased 4 vero 29 before i made any post here. i was more concerned with cost than efficiency or i would have bought the 3590 72v

 

[Roasty McToasty]

Yes i used 2100mA, but i have yet to use more than around 1100mA for my grow. If your not worried about efficiency, go ahead and do 2100mA. But you can only fit 3 on the driver i used. The 320w 2100mA driver would fit 4.

 

[cultivatorkid]

i am going to use two 2100mA drivers so i can use the ezmates. this what i have so far. i made this purchase before i asked any questions in here that is why it might look like i didnt take any of yalls advice. i am going to purchase the rest of what i need next week. the heatsink is 24"

 

[Roasty McToasty]

Very nice job ck. Looking forward to your finished lamp.

 

[rykus]

Thanks for the thread! Very informative, I appreciate the effort.

 

[Roasty McToasty]

Thanks for the thread! Very informative, I appreciate the effort.

Glad this is helping people make sense of DIY COBs. It pleases me when people find it useful.

 

[morvis]

Thanks for this, will this basic setup be sufficient to push 4 cobs as well?

 

[morvis]

Sorry, by 'this basic setup', I mean the single driver 3 cob one.

 

[Roasty McToasty]

Thanks for this, will this basic setup be sufficient to push 4 cobs as well?

You would need a driver to handle 152 volts to do 4 cobs on 1 driver. And you could not use the pico EZ-mates as they have a 130 volt max. But you could solder to the cobs instead. A 1400 mA driver may fit the 4 cobs.

 

[morvis]

Sweet thanks. I'd rather save the 170 bucks anyway =).

 

[Roasty McToasty]

Not sure how you save $170, but I'd like to know.

 

[morvis]

By being stoned and mis-reading your parts list in the beginning.

 

[CannaBuilding]

Great thread mate, Thanks for taking the time to post up all the info.

Im using vero29's and i've harvested the dankiest bud from these lights, COBS really are in a league of their own, hoping others jump on the bandwagon.

Peace.

 

[RiddleMeThis]

Thinking 3 of these 3 cob rails with vero 29 gen 7 3500ks in a 4x4. Hoping for 1k hps output, thoughts?

 

[Roasty McToasty]

Thinking 3 of these 3 cob rails with vero 29 gen 7 3500ks in a 4x4. Hoping for 1k hps output, thoughts?

Ya man you'd destroy what a 1000w hps would do with 3 like this. Probably could dim them some too.

 

[Uncle77]

So a 100k pot will dim the setup? Meaning that the pot will rotate? Just googled what is a 100k pot didn't know electrical stuff, just researching about a DiY lamp and found your thread. Very nice setup!