Fastslappy
Well-Known Member
my 'Ho made one is working but so far not any casings yet , it is not a overnight thing
Not really a fair fightI have several flavors of cobs now, and am working on getting more to experiment with.
I am flowering in a 24"Dx48"Wx60"H tent
(6) CXA3070 AB 3000K
(2) CXB3070 BB 3500K
(4) CXB3590 CD 3500K
(1) CXM-32 3000K
(1) CXM-32 3500K
(2) HLG-240H-42B drivers
I am working on a design to use them all or most of them while keeping them 50% efficient, and even higher in the case of the cxb cobs
This means th CXAs need to be run at 25W each or less
A lil comparison between the CXM-32 Luminus, and the CXB3590 Cree"
CX B3590: at 85C, 2.4A 12,500 lumens, at 50C 13137 lumens
CX B3070: at 85C, 1.925A 9750 lumens, at 50C 10486 lumens
The Luminus CXM32 per the data sheet is:
Min flux of 14545 at 85C, 2.640A
This would translate to approx:
13,381 at 2.4A and 11054 at 1.925A
At 50C should be:
14,451 at 2.4A and 11938 at 1.925A
Efficacy would be:
Cree CXB3590: 13137/(36*2.4)=152
Cree CXB3070: 10486/36*1.925)=151
Luminus CXM32: 14451/(52*2.4)=115
Luminus CXM32: 11938/(52*1.925)=119
Cree CXA3070: 8750/(39*1.925)=123
I am not that smart but I would go for cxa2530 or V13 if you want to space them 1foot apart!Question for you smart LED cob guys. Hlg-120h-c350 could run 16 vero 10s in a 4*4 tent for veg. Would that be good veg light or not. Thinking I could space them out for 1 per square foot at 9.356 watts. What is PPFD to thanks
So what's the best 6 cob recipe??Here are some units you could scale up to fit your space. To some extent, you can adjust the coverage by adjusting the distance to canopy.
@45.7%
(2) CXB3590 3500K CD 36V @ 2.5A (91.65W ea) $95
(2) HLN-80H-36A $90
183 dissipation W -> 99.37W heat
(2) Arctic 64 Plus CPU coolers $26
(2) lenses $8
83.63 PAR W covering 5 ft² = 749 PPFD
$219 = 2.62/PAR W
@49.7%
(2) CXB3590 3500K CD 72V @ 1.05A (75.5W ea) $95
(1) HLG-185H-C1400 (running at ~1050mA) $65
151 dissipation W -> 76W heat ->
passive cooled heatsink 9120cm² -> (2) 10"X10" heatsink $75
or
active cooled heatsink 3040 cm² min -> 3.5" X 30" heatsink (for spread) $40 + 80mm fan+psu $10
or
(2) Arctic 64 Plus CPU coolers $26
(2) lenses $8
75 PAR W covering 4ft² = 840 PPFD
75 PAR W covering 5ft² = 672 PPFD
$243 = $3.24/PAR W passive cooled
$218 = $2.91/PAR W active cooled on bar heatsink
$194 = $2.59/PAR W active cooled on CPU coolers (uniform spread, best value?)
@ 56.3%
(4) CXB3590 3500K CD 36V @ 1.4A (49W ea) $190
(1) HLG-185H-C1400 $65
196 dissipation W -> 85.7W heat ->
passive cooled heatsink 10284cm² -> 5.88" X 38" heatsink $72 (could split in 2 to improve uniformity/spread)
or
active cooled heatsink 3428cm² min -> 3.5"X36" heatsink (for spread) $45 +80mm fan +psu $10
(4) lenses $16
110.3 PAR W covering 6ft² = 824 PPFD
$311 = $3.07/PAR W passive cooled (great value point IMO, very efficient use of driver)
$326 = 2.96/PAR W active cooled
@61.2%
(5) CXB3590 3500K CD 36V @ 1.05A (35.5W ea) $237.50
(1) HLG-185H-C1050 $65
177.5 dissipation W -> 68.9W heat ->
passive cooled heatsink 8268cm² -> 4.9"X36" $70
or
active cooled heatsink 2756cm² -> 3.5"X36" heatsink (for spread) $45 + 80mm fan + psu $10
(5) lenses $20
108.63 PAR W covering 6ft² =
$392.50 = $3.61/PAR W passive cooled
$377.50 = $3.48/PAR W active cooled
@64%
(8 ) CXB3590 3500K CD @ 700mA (23W ea) $380
(1) HLG-185H-C700 $65
184 dissipation W ->66W heat ->
passive cooled heatsink 7920cm² -> 4.23"X44" $68 (could split these into 2 or 4 units)
or
active cooled heatsink 2640cm² -> 3.5"X36" heatsink (for spread) $45 + 80mm fan + psu $10
active cooled heatsink 2640cm² -> 1.8"X44" heatsink $34 + 80mm fan + psu $10
(8 ) lenses $32
117.8 PAR W covering 6ft² = 879 PPFD
117.8 PAR w covering 7ft² = 754 PPFD
$545 = $4.63/PAR W passive cooled (great option if your area is high electrical cost, Hawaii, NYC, SoCal etc or if your grow is already heat limited and you want to increase yield without running more AC, ducting and fans)
$532 = $4.52/PAR W active cooled 3.5"
$521 = $4.43/PAR W active cooled 1.8"
So in summary, the higher the efficiency goes, the more appealing passive cooling is. Less wires, less moving parts, less points of failure for about the same cost.
In what aspect?So what's the best 6 cob recipe??
Supra put together some build recipes based on efficiency, it appears, but jumps from 5 cob build to 8. For my purposes, it looks like any way I go, the 5 cob fixture is less flexible design wise but more efficient running wise than a 6 but I'm sure I haven't taken everything into account. I don't know what I don't know.In what aspect?
Boy do I know how that feels lolSupra put together some build recipes based on efficiency, it appears, but jumps from 5 cob build to 8. For my purposes, it looks like any way I go, the 5 cob fixture is less flexible design wise but more efficient running wise than a 6 but I'm sure I haven't taken everything into account. I don't know what I don't know.
I want to build a fixture just like @bizfactory has: two bars, 5.88, with space between them for the driver and boxes, very clean. Works for spread as well.Boy do I know how that feels lol
Alas, I am not an expert, either. I know just enough to recognize a given recipe's strengths and choose from there. Lots of people can help you with your conundrum, there's a thread about COB LED and how to power them. Best place I can think of to ask that question.I want to build a fixture just like @bizfactory has: two bars, 5.88, with space between them for the driver and boxes, very clean. Works for spread as well.
I spec'd out 6 cob's and a 240-1050 but it came out to be not as effective as the 5 cob light with a 240-1400. It would be fine if they were equal but it doesn't appear that they are. That said, I don't know if I'm figuring this out properly.
Thats because 6 cobs on a240-1050 is running at 1050mA and 5 cobs on 240-1400 are running at 1400mA. You need to start with the the size of your space and work backwards. More cobs run at a lower current is better for spread and efficiency but less cobs run at a higher current is cheaper start up.I want to build a fixture just like @bizfactory has: two bars, 5.88, with space between them for the driver and boxes, very clean. Works for spread as well.
I spec'd out 6 cob's and a 240-1050 but it came out to be not as effective as the 5 cob light with a 240-1400. It would be fine if they were equal but it doesn't appear that they are. That said, I don't know if I'm figuring this out properly.
I've worked it "backwards" as you say and the best setup is a design like @bizfactory but 5 cobs on two bars, which is a great option spec wise, seems uneven spread wise.Thats because 6 cobs on a240-1050 is running at 1050mA and 5 cobs on 240-1400 are running at 1400mA. You need to start with the the size of your space and work backwards. More cobs run at a lower current is better for spread and efficiency but less cobs run at a higher current is cheaper start up.
What size heat sink is that built on?Here you go this light is a CXB3590 6500k DD bin the highest you can get and I run it soft like 59w but can go up to 200w
View attachment 3596670
Couldn't you just use two 185s instead of a single 240? And use 1400s with dimmers?I've worked it "backwards" as you say and the best setup is a design like @bizfactory but 5 cobs on two bars, which is a great option spec wise, seems uneven spread wise.
My other option is to have two drivers running 3 each which does work but it's not the most cost effective option.
It's funny to me that virtually every option seems easy except for 6 cob's lol.
Yeah if you are set on only 1 driver it limits you a bit. You could use 2 HLG-120H-C1400 with 3 x 3590s on each. They are a bit cheaper.I've worked it "backwards" as you say and the best setup is a design like @bizfactory but 5 cobs on two bars, which is a great option spec wise, seems uneven spread wise.
My other option is to have two drivers running 3 each which does work but it's not the most cost effective option.
It's funny to me that virtually every option seems easy except for 6 cob's lol.
My primary concern is output and efficiency. Also knowing what I'm talking about would be a bonus lolYeah if you are set on only 1 driver it limits you a bit. You could use 2 HLG-120H-C1400 with 3 x 3590s on each. They are a bit cheaper.
Asking for a lot, aren't you? LolMy primary concern is output and efficiency. Also knowing what I'm talking about would be a bonus lol