Lighting 636 PPF or 1104 PPF for 2'x4' tent

[dankle]

Hi all, I am beginning my next jouney into the COB world, would like to share specs and opinions regarding ppf.

Going with..

6*048-1212 @ 50W (2x 4000k; 4x 3000k 80 CRI)
HLG-320H-C1400B driver
Arctic CPU heatsinks
Thermal adhesive for mounting

2x 5gal air pots w/ Roots soil
Top twice for SCROG (will be first time topping)
Organic nutrient and compost teas

Should cost only $240 for the parts meaning 2.67 PF/$ (sorry if this is incorrect unit) or $0.8/W

From datasheets I've calculated that 6*048-1212 COBs at 50W each should provide 636 PPF or 715 PPFD in the 8 sqft tent.

My question is should I keep adding lights once the 6 048s are complete? I've calculated that adding 2x 058-1825s with a HLG-240H-C2100B meanwell should add another 504 PPF for a total of 1104 pr 1242 PPFD. Which would run another 195 dollars or so, unless I used the 058s which are already running (at 70W).

I'm on a budget and want to maximize light intensity for least cost. Would the yield difference justify adding 2x 058-1825s @ 109W ea? Are the 6x 048s plenty of light for a 2x4 tent? Or should I add all the juice I can to the punchbowl?

Looking to grow some Dinafem OG Kush photoperiods and seeking to maximize yield this time. How long would you veg?

thanks for reading, peace

 

[BigSm0]

If your on budget maybe consider running a few more cobs at a lower amperage. 8-1812's would probably be the best bang for your buck.

Cob kits has hlg-120h-48 which can run 4 1812's at 37w each for 32$ That will put you just about 300w for the best lit 2x4 ever

 

[dankle]

hm but wouldn't that add up to be more with the additional heatsinks?

I found some 048-1212s for 10 ea shipped on ebay. Pretty fixated between those and the 1825s @ 38 each + shipping. Feel like it might be hard to beat the 1212s.

But let me keep an open mind and run some numbers before speaking more hoobla.

 

[BigSm0]

10 is very cheap. Even with a fairly lager discount from cdi I pay just over that. The only reason I suggested the 1812's was because there is a 5% efficiency increase and they are only 16 dollars each. To run them at same wattage they require less amperage.

 

[dankle]

yeah I could've gone with a 3 cob 1825 HLG-240-C1400B setup for about the same price of the 2 cob 1825 HLG-185-C1400B setup I built, had I found the sources I have now.

building cobs is a lot of fun.

there's a listing on ebay for 180 048-1212s on ebay for about $6 each free shipping from Estonia. would be pretty cool to organize a group buy for em.

ordered a couple 4000k 1212s earlier to get veg starting. looking forward to this build/grow thanks for all the cobbers and number crunchers out there

 

[BigSm0]

All good options. I'm surprised they are selling that cheap on eBay.

 

[BigSm0]

If they were that largely discounted but 1812's I would buy it in a second. I think citizen sells the 1812's for around 10 each and I pay 12. If I dealt with citizen there would be a 4 week wait and also large order only.