DiY LED - Cree CXA3070
- Thread starter SupraSPL
- Start date
lapin
Active Member
except, i found another shop selling it for 200$ rmb each. i just spent the last hour running around trying to find arctic silver thermal paste....NO DICE. It's like christmas and the toys are hanging in trees!
@Dloomis514 no powersupply yet. I was hoping to dig around boxes at home until i found one to power both the fans. not that i trust the writing on the box, but here's what it lists:
rated voltage: 12dvc
operating voltage: 10.8~13.2vdc
starting voltage: 7vdc
rated current: 0.12 -+10%A
power input: 1.44w
max rpm: 1300RPM
ideally I'd like to have these spinning low.
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Dloomis514
Well-Known Member
I am not an expert, but when i read those fan specs it seems like you will need a laptop charger at 12v to get the starting voltage you need.
Dloomis514
Well-Known Member
He is like Santa, he never sleeps, and knows whats good and bad, so you better watch out!I was guessing for 2 fans wired in series; 12v 0.2A power supply. but I'll listen when the guru @SupraSPL awakens
lapin
Active Member
i hope santa's gonna be nice!
this is how far im going to get tonight. fans mounted on heatsyncs with some longass m4 bolts.
thoughts on drivers mounted to the sides of the heatsyncs, OR ontop of the growbox and a wires running into the box to each of the cobs ? which design would be most efficient in keeping the drivers and cobs cool?
this is how far im going to get tonight. fans mounted on heatsyncs with some longass m4 bolts.
thoughts on drivers mounted to the sides of the heatsyncs, OR ontop of the growbox and a wires running into the box to each of the cobs ? which design would be most efficient in keeping the drivers and cobs cool?
I like on top of the heatsink. fits neatly in between the fans and takes advantage of the fans and natural convection. Outside is better, but for the extra wires\logistics not sure its worth it.
lapin
Active Member
i live in a warm, sticky humid asian city with protests and police beatings as we speak
trying to keep the whole cabinet low heat, ideally fanless but for the extra spendings on two fans i figure it's worth it overall.this is all going inside a stealthy 2'x2.5'x4.5' cabinet ala
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DonPetro
Well-Known Member
That is pretty bright!
I was curious about how much heat drivers added to a grow space as well. I like the idea of having drivers on board as it keeps everything packaged together, less wiring, etc. Does the amount of heat given off by the drivers directly relate to the current that the driver is pushing? Do aluminum cased drivers run cooler than plastic cased models? Does a driver with higher efficiency run cooler than one with lower efficiency?
I was curious about how much heat drivers added to a grow space as well. I like the idea of having drivers on board as it keeps everything packaged together, less wiring, etc. Does the amount of heat given off by the drivers directly relate to the current that the driver is pushing? Do aluminum cased drivers run cooler than plastic cased models? Does a driver with higher efficiency run cooler than one with lower efficiency?
SupraSPL
Well-Known Member
You have the right idea. In this case 1.4A * 38V = 53W COB dissipation. The COBs are 42% efficient so 22W of light and 31W of heat. Those drivers are 85% efficient so 63W actual draw, 10W becomes heat inside the driver and 53W goes to the COB. So total heat = 31+10=41W per COB/driver. There will also be some heat from the fans and fan power adapter.
Yes it is true, a higher efficiency driver will create less heat to do the same job. But an aluminum driver will create the same amount of heat as a plastic driver if they are the same efficiency.
Yes it is true, a higher efficiency driver will create less heat to do the same job. But an aluminum driver will create the same amount of heat as a plastic driver if they are the same efficiency.
Dloomis514
Well-Known Member
I use the material i have on hand, i didn't have bolts so i used gorilla glue, they still seem stuck together.
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Attachments
Dloomis514
Well-Known Member
oh BINDER clips, lol, now i know what you mean!
https://www.google.com/search?q=binder+clips&rlz=1C1GIGM_enUS572US572&espv=2&source=lnms&tbm=isch&sa=X&ei=mbyJVKutEsOHNqS3g4AD&ved=0CAkQ_AUoAg&biw=1920&bih=993
SupraSPL
Well-Known Member
Got 5 new ladies to select from, Rare Dankness - Commerce City Kush (Chem4 x Rare Dankness #1) finishing up, they are at 54 days. Will get pics with the good camera when they are 100% done. Great smells and looks like good yields as well. Grown by CXA3070 3000K @ 800-900mA.
Overhead shot
Overhead shot
AquariusPanta
Well-Known Member
Supra, I think I spotted a seed...
The plant(s) looks stellar! Should be be one helluva smoke in due time!
alef
Active Member
Dear Supra, mates,
I want to DIY the solution for my cabinet which is 1200*600*2500mm. Basically my need is a lamp which will cover the full square. I red about the overlightining so want to know more about the appropriate wattage/lm per square meter/foot. I am choosing in between the Cree (3070) and Bridgelux (vero 29). The second ones are less efficient but cheaper. will 2 cree be enough to cover the area? want to go with 4k color as the most optimal imho.
I want to DIY the solution for my cabinet which is 1200*600*2500mm. Basically my need is a lamp which will cover the full square. I red about the overlightining so want to know more about the appropriate wattage/lm per square meter/foot. I am choosing in between the Cree (3070) and Bridgelux (vero 29). The second ones are less efficient but cheaper. will 2 cree be enough to cover the area? want to go with 4k color as the most optimal imho.
Dloomis514
Well-Known Member
If my math it's right You have 4 by 2 by 8 feet. I don't think two Cree will do out, three or four would be better. Rule of thumb is one Cree per square foot of canopy
Bueno Time
Well-Known Member
That's roughly 2'x4'x8' cab I think thats way too big for only two 3070s or 29s.
captainmorgan
Well-Known Member
I run six 3070's at 1400ma in a 2.5 x 4.5 over two plants.