High CRI 90+ vs. Efficacy

[JorgeGonzales]

Huh? It's what Cree sells as 3000K. It's 3000K+ actually.
View attachment 3736836

I trust you, I don't trust that chart. I haven't seen blue/CCT increase with CRI like that from any other manufacturer. I have however seen lots of mistakes in data sheets. Samsung has all 80 CRI charts in one of their 90 CRI led data sheets. Shit happens.

Is there SPD data for their 3500K 80CRI cob? I still don't have that.

 

[tags420]

There have been multiple people to take 3500k and 3000k crees and put them on a real spectroradiometer and confirmed the chart posted, or give 3500k in the first place.

How do you think 3500k got so popular. Most originally were only using 3K cause that's what the guy thy copied did. Then someone tested others openly for everyone to see. The promise of that the extra bin made up for any morphology and spectral shifts. It also maintained near absolute values of the 3K but with a slight blue bump. Ow and behold it was just as science has said for years...photons first.
It is funny is that everyone wants to stay up there. I sure as hell don't. If 3K and 3500K were the same bin we would never have drifted up in the first place. And at one time back with CXA(ya, most of you new cob puppies weren't even RIU member or led users) 4K was where the bin jump was. An hence why it was tested first. Not to mention all the vero testing that went on back then too. With their phosphors erring on the warmer side of the "official" CCT. Then people actually used them in the real world too. Not data sheet humping.(didn't say anything didn't work...just that humping the data sheets isn't the way to show use in the real world).

Like I said, It was confirmed that the SPD's were right where they needed to be. And were/are consistent.
3000k testing at ~3000-3100K
and another

3500K testing in at ~3350-3375K
and another
Those are from different sources around the world, at different times, with different suppliers.
Cree doesn't ever show a 3500K spd...I highly doubt that they put a 3500K in the test chamber then fucked up and used it as 3K high cri.Maybe use your digitalizing skills and actually look at the data sheet and detail on spectrum like Alesh showed.

As for phosphors...They are nearly all the same. Check cross licenses on white leds...most of nichia patents are still in effect.

Just because hps are going out of certain states on a legal/environmental terms...doesn't erase their performance and the bar they have set. LEDs still need to be better OR cheaper in order to replace. Again...results need to be shown by many and on large scales. Growers are really going to be pissed when you take their 30-06's and giving them 22's on a moose hunt with the sales pitch..." you have to move to lesser performing or we will fine the shit out of you". That is not LED's making progress I'm sorry to say.

 

[JorgeGonzales]

There have been multiple people to take 3500k and 3000k crees and put them on a real spectroradiometer and confirmed the chart posted, or give 3500k in the first place.

...snip....

Those are from different sources around the world, at different times, with different suppliers.
Cree doesn't ever show a 3500K spd...I highly doubt that they put a 3500K in the test chamber then fucked up and used it as 3K high cri.Maybe use your digitalizing skills and actually look at the data sheet and detail on spectrum like Alesh showed.

Not sure what your point is? Here is an 3500K 80CRI SPD chart courtesy of @Malocan from two days ago, in a thread I've been pretty active in:

CCT: 3497.5K

So, um...thanks? We are talking about the 3000K 90CRI chart Cree provides. Gee, maybe I should use my digitizing skills:



CXB3590 3000K 80CRI - 3062K:



CXB3590 3000K 90CRI - 3534K:



Is that clear enough?

 

[tags420]

Good for you for being active with your keyboard over there. Just an FYI... @goud already showed the 90CRI 3K calced to ~3400K months ago, then @Malocan confirmed it. An thanks you @Malocan for doing all that and buying the meter...stepping up like a boss.
Again...real world testing confirming crees real world testing. Just like if you put any other manufacture up against their own data sheet...it's going to be really consistent and well within the stated error ranges. It has nothing to do with cree, citi, bridgelux, nichia..anyone specific. It has to do with actually reading and understanding what is presented by the manufacturer.

So sensei...how does it differ from the posted 3K 90CRI in the data sheets? Cree can call it whatever they want, but things are what they are. And what they are offering as 3K high cri is consistent. You can be pissed and say cree is shitty because their 3K 90cri is 3400K...but doesn't change what it is. Reality is what matters, and this is the reality. You don't need to believe for things to be truths.
And ps...you specifially asked for 3500K 80cri...

Is there SPD data for their 3500K 80CRI cob? I still don't have that.

 

[Tactical Farmer]

I like Citizen cobs !

 

[JorgeGonzales]

Good for you for being active with your keyboard over there. Just an FYI... @goud already showed the 90CRI 3K calced to ~3400K months ago, then @Malocan confirmed it. An thanks you @Malocan for doing all that and buying the meter...stepping up like a boss.
Again...real world testing confirming crees real world testing. Just like if you put any other manufacture up against their own data sheet...it's going to be really consistent and well within the stated error ranges. It has nothing to do with cree, citi, bridgelux, nichia..anyone specific. It has to do with actually reading and understanding what is presented by the manufacturer.

So sensei...how does it differ from the posted 3K 90CRI in the data sheets? Cree can call it whatever they want, but things are what they are. And what they are offering as 3K high cri is consistent. You can be pissed and say cree is shitty because their 3K 90cri is 3400K...but doesn't change what it is. Reality is what matters, and this is the reality. You don't need to believe for things to be truths.
And ps...you specifially asked for 3500K 80cri...

Honestly, I have no idea what any of this means. Sorry, but it's really hard to make sense of. Pretty sure you are being bizarrely hostile, but that's about all I am taking away. I keep trying to type a response to this and just...huh? What did Malocan confirm? Who said data sheets aren't consistent with real world results? I am pissed about what? Cree is shitty?

I just think it's a typo, a 3500K chart labeled as a 3000K chart. I could give you other examples of data sheet mistakes, but I have a feeling it wouldn't do much good. If the 3000K 90CRI has been under a spectrometer, great, I must have missed that. Link? If not, claiming some crap in a data sheet is "reality" might be a little premature.

 

[ttystikk]

In any case, to address a different point entirely, high CRI isn't necessarily the goal with these chips; people are gravitating towards them because of where they spike in the deep red range. I bet they're great chips.

 

[churchhaze]

Not sure what your point is? Here is an 3500K 80CRI SPD chart courtesy of @Malocan from two days ago, in a thread I've been pretty active in: View attachment 3737293

CCT: 3497.5K

So, um...thanks? We are talking about the 3000K 90CRI chart Cree provides. Gee, maybe I should use my digitizing skills:

View attachment 3737311

CXB3590 3000K 80CRI - 3062K:
View attachment 3737296


CXB3590 3000K 90CRI - 3534K:

View attachment 3737295

Is that clear enough?

That's how they get ya!!!

 

[Rahz]

4 samples each of 5 different spectrums are on the way, 2700-3500K and 70-90 CRI. Each sample set will be placed in a 1 foot grid and measured under the center point so this should negate any voltage differences. I'll use the same driver for all 5 lamps so we should get a pretty good idea of how the high CRI phosphors perform in the PAR range.

8 week lead time unfortunately

 

[BOBBY_G]

which brand rahz?

 

[Rahz]

1825s, It's an opportunity to get new toys. Would be nice to throw some other brands in but it's hard to justify spending more on what is essentially a CRI test.

 

[BOBBY_G]

pm me your addy i can send you the 2700-3500 in 80 and 90 tomorrow

 

[JorgeGonzales]

Teamwork!