bassman999
Well-Known Member
Any BB or BD bins at that price in the higher spectra?
CXB3590 1500W
- Thread starter SupraSPL
- Start date
so the ceramic used in ceramic backed cobs conducts heat better than aluminum, how about copper ?
SupraSPL
Well-Known Member
Cree CX series uses Alumina Nitride ceramic (AiN) , which has the potential to conduct heat almost as well as aluminum, although they do not specify the W//mK of the material they are using. The aluminum used in our HeatsinkUSA is 6063-T5 and 6063-T6 alloy which is 200-209W/mK. Not sure what the thermal conductivity of the aluminum used in the Vero is.
I have wondered if CREE's use of AiN is the reason it can reach higher levels of efficiency at low current or of it just has to with the the architecture of the dies. There is something different between the architecture of the two designs.
I have wondered if CREE's use of AiN is the reason it can reach higher levels of efficiency at low current or of it just has to with the the architecture of the dies. There is something different between the architecture of the two designs.
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vahpor
Well-Known Member
By what I know from CPU heatsinks, copper is great for 'transfering' or 'moving' heat from one location to another, but it does not dissipate / radiate very well, which is why a lot of air cpu coolers use copper heat pipes attached to aluminum fins, for dissipation.
I think copper water blocks worked well, but there may be something better now days on the water cooling front.
welight
Well-Known Member
welight
Well-Known Member
Copper is probably the best material, however depends on the structure of the chip. We use direct thermal path(pillar) design in a lot of our normal led PCBS because it performs better than alum and as a material it is easy to use. I suspect it is not used more in COB design as it would add a fair bit of cost
Cheers
Mark
bassman999
Well-Known Member
I know some people are gonna be on this!
thanks for the info... btw if copper is best, then alum must be better than ceramic since the conductivity of aluminum IS higher than the ceramic backing the cree cobs. that also might explain why the vero 29 likes to be driven hard, aluminum backing.
SaltyNuts
Well-Known Member
I just learned what thermal emissivity is. My guess is although the aluminum nitride conducts heat a little less than some aluminum, its higher thermal emissivity makes up for that, since it quickly releases heat to the external heatsink. I never knew why some materials get hot in the sun and others don't. Now I know.
bassman999
Well-Known Member
Same with the Luminus Devices with the aluminum backing
SaltyNuts
Well-Known Member
Five CXB3070 at on an HLG 185H-C1050 and a massive heatsink should be more than enough?
I've been wondering what I would like to do with a similar size space. The easiest idea is three cxb-3590 or cxb-3070 on a single heat sink. The meanwell hlg-120h-c1400 would drive three 36v cobs at apx. 50w each or you could spend $5 more for the hlg-185h-c1400 and have the ability to run an extra cob or a handful of cree XM-L2 chips along with the other three.
ttystikk
Well-Known Member
IT DEPENDS; amps don't help, need watts dissipated, but in general the variable factors are;
strain
How well hardened off to intense light
Room temp
Room RH
Room CO2 levels
How wet you keep them, soil or hydro
I'd start at 24" and work my way down if needed.
ttystikk
Well-Known Member
Yes, are there lenses on those COBs? Tighter lenses means more intensity.
Yeah, those 80 deg lenses. I don't really see any problem with my plants since I have those CXBs running, in-fact my plants are growing like MoFos now! Except one plant/strain might look like as if there MIGHT be some discoloration *possibly* from the light, but that could be the strain or it could be normal. Anyway I will up the lights somewhat today, have them at 18" currently.
DarthBlazeAnthony
Well-Known Member
How many cxb3590's do I need to cover a 4x4 flower area?
PerroVerde
Well-Known Member
What kind of PPFD are you wanting and what's your budget?