Cree recommended Xlamp LED DIY Build

welight

welight

Well-Known Member
I think your concept has a lot of merit, I think also you need to take the concept of a reference design with its intended purpose, that is it is never an absolute design, it is intended to promote discussion and ideas. Cree dont promote COBS to the grow industry because they dont fully get the idea of Soft COB, this has also been discussed here in many threads. The XPG3 is a cutting edge led but would certainly consider moving to the newer 660nm HE version which will give you a jump in red. The Ledil 2x6 optics have a variety of beams available, but you could also break it into 2x4 or other config's that may open up more beam angle options, good luck with it
Cheers
Mark
 
ttystikk

ttystikk

Well-Known Member
CobKits said:
that the gavita casts a lot of light outside of the 4x4 area which is completely discarded and they compare it with highly focused lenses in an area it perfectly covers

that they claim a light that is 1.82 umol/J in a sphere is twice as efficient as one that is 1.72

its maybe one step above that dude who measures oohmoles at single point, with some fancy graphs and a cree logo on it.
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To look at this from the opposite perspective; lenses focus light onto the canopy more efficiently. LED is also directional. Even if spectrum weren't superior, this would be enough to switch.

And spectrum is superior. That's why quality is superior.
 
CobKits

CobKits

Well-Known Member
or you could put both of those setups in a real tent and yield a lot more with a gavita as your ppf would be 70+% higher (and use twice the energy in the process)
 
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NaturalFarmer

NaturalFarmer

Well-Known Member
welight said:
Cree dont promote COBS to the grow industry because they dont fully get the idea of Soft COB, this has also been discussed here in many threads. The XPG3 is a cutting edge led but would certainly consider moving to the newer 660nm HE version which will give you a jump in red.
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I think Cree knows they can drive COBs below 100%? This unit is being driven soft is it not?
The XP-E is 660 Photo red an I think thats what you are referring to? Im not sure when the HE will be available or if there is a big difference or any at all. 650-670 vs 660 only?
The XP-G3 is full spectrum....these are the 4000k.
 
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NaturalFarmer

NaturalFarmer

Well-Known Member
CobKits said:
Heh, still waiting on my sinkpads from 6 mos ago
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They probably knew you were a COB guy/gal and not a serious buyer;)
Well I need more than 3 anyhow to make even one of the engines so I'm not waiting around for it but Ive learned to never scoff at free.
 
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welight

welight

Well-Known Member
NaturalFarmer said:
I think Cree knows they can drive COBs below 100%? This unit is being driven soft is it not?
The XP-E is 660 Photo red an I think thats what you are referring to? Im not sure when the HE will be available or if there is a big difference or any at all. 650-670 vs 660 only?
The XP-G3 is full spectrum....these are the 4000k.
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Yes I realise they know, my point is they dont market that as an approach
HE is a higher output not a different wavelength, Cree shipped me 1k pcs yesterday, XPG3 is white, the spectrum is related to what CCT you order
Cheers
Mark
 
NaturalFarmer

NaturalFarmer

Well-Known Member
welight said:
Yes I realise they know, my point is they dont market that as an approach
HE is a higher output not a different wavelength, Cree shipped me 1k pcs yesterday, XPG3 is white, the spectrum is related to what CCT you order
Cheers
Mark
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Thanks Mark. Can you link me your site? Is it Cutter?
edit: Man, I got to start reading this shit prior to posting:)
 
NaturalFarmer

NaturalFarmer

Well-Known Member
VegasWinner said:
ChilledLed does not use COB's and seems to grow some nice budz according to @Growmau5 isusing it right now. From what I can see. it does very well.I am not sure of the wattage, but here is a the video.
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What are they using? Ill have to check out those videos more when I get a minute. Thanks for the link.

That ceiling fan in the video would fuck my world up. Never seen that in a room before. I like it but I'm a forgetful bastard .
 
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CobKits

CobKits

Well-Known Member
NaturalFarmer said:
What are they using? Ill have to check out those videos more when I get a minute. Thanks for the link.

That ceiling fan in the video would fuck my world up. Never seen that in a room before. I like it but I'm a forgetful bastard .
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theres a thread about it. i think theyre all luxeon chips
 
MeGaKiLlErMaN

MeGaKiLlErMaN

Well-Known Member
ttystikk said:
To look at this from the opposite perspective; lenses focus light onto the canopy more efficiently. LED is also directional. Even if spectrum weren't superior, this would be enough to switch.

And spectrum is superior. That's why quality is superior.
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Yes but at around a 10% loss. for the 90 Degree ones at least.
 
MeGaKiLlErMaN

MeGaKiLlErMaN

Well-Known Member
CobKits said:
yes when your study picks an arbitrary area and compares fixtures with different beam angle and then discards all the light that falls outside of the area. im as pro-LED as they come but that study was invalid
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But if all perimeters are the same its the best test to have to compare lights, yes light may fall outsize the area, but I run my DE around 2ft above so not much out of the footprint. The light outside the footprint can hardly be called usable, unless you have alot of overlap.
 
ttystikk

ttystikk

Well-Known Member
MeGaKiLlErMaN said:
Yes but at around a 10% loss. for the 90 Degree ones at least.
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MeGaKiLlErMaN said:
But if all perimeters are the same its the best test to have to compare lights, yes light may fall outsize the area, but I run my DE around 2ft above so not much out of the footprint. The light outside the footprint can hardly be called usable, unless you have alot of overlap.
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Lenses fix this problem for COB LED, but you won't give them credit. Why not?
 
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