I've got something that crushes all the other COBs and other lights

REALSTYLES

REALSTYLES

Well-Known Member
sixstring2112 said:
So did they get better between the 29th and 31st? This thread is a fuckin joke right? Or was the intended concept me and my budddy supra got a secret and i cant tell but its not really a secret i just wanted some attention lol ?
Yer a trip realz haha.
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funny thing is @Greengenes707 had them and didn't say anything about them I just wanted to build up to tell everyone and it worked lol.
 
CobKits

CobKits

Well-Known Member
so with the bin jump does this mean that cree has caught up to the other mfr's current flagship products? and when will we be seeing the 200W cobs?
 
Malocan

Malocan

Well-Known Member
REALSTYLES said:
funny thing is @Greengenes707 had them and didn't say anything about them I just wanted to build up to tell everyone and it worked lol.
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maybe he didnt make such a hype about them, because there are not so special like you told here. According to cree pct, the new vero 29 should be even a bit better. But maybe the reallity looks different.

edit: 240Lm/W in your dreams maybe
 
REALSTYLES

REALSTYLES

Well-Known Member
Malocan said:
maybe he didnt make such a hype about them, because there are not so special like you told here. According to cree pct, the new vero 29 should be even a bit better. But maybe the reallity looks different.

edit: 240Lm/W in your dreams maybe
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240lm/w is for real but nice try why you so bitter? Do you have the info on these cobs? Or you here to to talk trash?
 
Malocan

Malocan

Well-Known Member
REALSTYLES said:
240lm/w is for real but nice try why you so bitter? Do you have the info on these cobs? Or you here to to talk trash?
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i thought there is coming something real special according to your posts, but now im a bit disappointed.
it is DB bin? if yes, like i said according to cree PCT they seems not so mega killer
 
REALSTYLES

REALSTYLES

Well-Known Member
Malocan said:
i thought there is coming something real special according to your posts, but now im a bit disappointed.
it is DB bin? if yes, like i said according to cree PCT they seems not so mega killer
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Supra did the calculations and you know the PCT isn't correct it's off a bit
 
T

TogiX

Active Member
REALSTYLES said:
@11w though to get 240lm/w lol
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Any proof here? I keep seeing people say to drive COBs @ 5-10w for 65-70% efficiency but when we finally get any sort of sphere data the numbers are far lower than I thought. According to the ChilLed CXB 3500k CD bin test: https://chilledgrowlights.com/independent-lab-reports/lab-test-report-cree-xlamp-cxb3590-3500k-cd-bin

@23.453w we're seeing a whopping 52.5% radiant efficiency, when some of our measurements (read: guesstimations now) said we'd be hitting over 64% efficiency.

I'm having a hard time seeing us reaching 70% efficiency at half the wattage and one higher bin, even if it almost matches Vero 29C.
 
frica

frica

Well-Known Member
TogiX said:
Any proof here? I keep seeing people say to drive COBs @ 5-10w for 65-70% efficiency but when we finally get any sort of sphere data the numbers are far lower than I thought. According to the ChilLed CXB 3500k CD bin test: https://chilledgrowlights.com/independent-lab-reports/lab-test-report-cree-xlamp-cxb3590-3500k-cd-bin

@23.453w we're seeing a whopping 52.5% radiant efficiency, when some of our measurements (read: guesstimations now) said we'd be hitting over 64% efficiency.

I'm having a hard time seeing us reaching 70% efficiency at half the wattage and one higher bin, even if it almost matches Vero 29C.
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It actually seems about right, people are just overly optimistic about their junction temp.
With a Tj of 85 celcius, the Cree calculator gives about the same lm/w as the sphere test.

With a junction temp of 40 degrees celcius it's 1.10 times as efficient (as one at 85 degrees celcius).

Also case temp =! junction temp.

The people who are saying it'd be 64% efficient are assuming a 25 degrees celcius junction temp and no driver losses.
And people may have been assuming the maximum amount of Flux in the bin and not the minimum amount.
 
T

TogiX

Active Member
frica said:
It actually seems about right, people are just overly optimistic about their junction temp.
With a Tj of 85 celcius, the Cree calculator gives about the same lm/w as the sphere test.

With a junction temp of 40 degrees celcius it's 1.10 times as efficient (as one at 85 degrees celcius).

Also case temp =! junction temp.

The people who are saying it'd be 64% efficient are assuming a 25 degrees celcius junction temp and no driver losses.
And people may have been assuming the maximum amount of Flux in the bin and not the minimum amount.
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Now I wish they'd included junction temps in the sphere tests (only ambient @ 25.1c). Not sure how these sphere tests work but something tells me they do a few quick pulses so I don't think the junction temps are that big of a factor in the testing environment. Could be wrong though. Junction temps and driver losses would explain a lot, but I still don't see them hitting 70% efficiency.

Guess we'll have to wait until people actually start putting an integrating sphere to work around here....... It's pretty frustrating because I've been waiting on sphere data from people saying months ago that they "have one and it'll only be a few weeks until testing," meanwhile I'm still figuring whether I should buy 3 1212's and drive them @ ~16w a piece or buy one Vero 29C, drive it at 50w and be done with the whole thing.
 
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licoricetree

licoricetree

Well-Known Member
Defiantly wanna see sphere results cxm-32 gen3 vs cree cxb3590 db that would be interesting.But should we compare a 36v to a 36v like vero d.
 
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