PAR test of cree vs citi vs cutter

JorgeGonzales

JorgeGonzales

Well-Known Member
Last but not least, @BOBBY_G is so right about the 1825. The CLU058s are the king of high watts, and it's a great value. He isn't the first person to mention Cree DB bins after testing.
 
BOBBY_G

BOBBY_G

Well-Known Member
Well thats what i measured. ppfd @ 15" in umol.... and related it to cob input watts... same as supra.
 
OLD MOTHER SATIVA

OLD MOTHER SATIVA

Well-Known Member
i have 13 vero 18's and nichia 130B's i have not hooked up to anything [drivers/heatsinks not here]
we will see..bought nichia;s because they were cheap..close by and the cl121 were 6-8 wks..
maybe next time
have finally got my three 4 cob 3590 bars hung...beside a spectrumking with no hood ...
gotta do more work [get some new test sativas started ]
 
BOBBY_G

BOBBY_G

Well-Known Member
JorgeGonzales said:
Last but not least, @BOBBY_G is so right about the 1825. The CLU058s are the king of high watts, and it's a great value. He isn't the first person to mention Cree DB bins after testing.
Click to expand...
in all fairness those were 5000k chips but i would anticipate the 3500k 80 CRI citis hang with CD bins, etc.

cree may still be at or near the top if we see DB 3500k and DD 4000-6500K this year, but citi also has a new rev out in january

and we havent even seen bridgelux's latest. good time to be a dork.
 
Greengenes707

Greengenes707

Well-Known Member
Running soft is always more efficient. And now that everyone is finally aboard with "density is intensity"...we see it happening

Cree's blue die still seem to be top dog. But that doesn't mean you can't implement other's to outperform like citizen possibly has.

In the 50w range...
Cree 3590= ~100ma per die....14 strings of 12
Citizen 1825= ~40ma per die...25 strings or 18

Nothing can really be said outside data sheet comparisons till they are put in a sphere or on a goniophotometer...and technically the data sheets came from a sphere. It's definitely eye raising. Citi needs to re arrange some strings and get a normal 36v going on.

I've been supposed to meet with the citizen guy soon, we just never have the same schedule. I'll see what kind of price I could maybe get them down to.
 
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BOBBY_G

BOBBY_G

Well-Known Member
Greengenes707 said:
s finally aboard with "density is intensity"...we see it happening

Cree's blue die still seem to be top dog. But that doesn't mean you can't implement other's to outperform like citizen possibly has.

In the 50w range...
Cree 3590= ~100ma per die....14 strings of 12
Citizen 1825= ~40ma per die...25 strings or 18
Click to expand...
so what youre saying is crees should be $20 then?
 
BOBBY_G

BOBBY_G

Well-Known Member
Greengenes707 said:
Nothing can really be said outside data sheet comparisons till they are put in a sphere or on a goniophotometer...and technically the data sheets came from a sphere. It's definitely eye raising. Citi needs to re arrange some strings and get a normal 36v going on.
Click to expand...
well their claimed specs led me to do a real comparison of mutiple mfrs under real world conditions. we can get all fancy-schmantzy but at the end of the day, show me a more relevant comparison than ppfd delivered at x distance vs wattage. all chips are similar in their 115ish degree pattern so i could do complex par maps but this is more about the fundamentals of an LES throwing down the photons at a distance close enough to be relevant. the sheer fact that citi tracks the "industry leading at low wattage" performance of the cree should raise eyebrows in itself... at cree's premium... esp after citi dusts cree by 30-50% at higher wattages.. real hard to bury that lead as a bias.....

the only thing citi needs to "rearrange" is their poor distribution model, because theres nothing magical about 36V other than cree chose that for their flagship line. on a $/par basis there is no better value on the LES side that im aware of

in fact its fundamental that higher voltages are more efficient (hardly a talking point, but not a penalty nonetheless)
 
Greengenes707

Greengenes707

Well-Known Member
BOBBY_G said:
so what youre saying is crees should be $20 then?
Click to expand...
New bins are cool, will fill a little time.
But the new chips are even cooler ;)

I don't have brand loyalty, or any stockpile of crees I need to get rid of. Whoever or whatever works best.
BOBBY_G said:
well their claimed specs led me to do a real comparison of mutiple mfrs under real world conditions. we can get all fancy-schmantzy but at the end of the day, show me a more relevant comparison than ppfd delivered at x distance vs wattage. all chips are similar in their 115ish degree pattern so i could do complex par maps but this is more about the fundamentals of an LES throwing down the photons at a distance close enough to be relevant. the sheer fact that citi tracks the "industry leading at low wattage" performance of the cree should raise eyebrows in itself... at cree's premium... esp after citi dusts cree by 30-50% at higher wattages.. real hard to bury that lead as a bias.....

the only thing citi needs to "rearrange" is their poor distribution model, because theres nothing magical about 36V other than cree chose that for their flagship line. on a $/par basis there is no better value on the LES side that im aware of

in fact its fundamental that higher voltages are more efficient (hardly a talking point, but not a penalty nonetheless)
Click to expand...
The voltage makes driver compatibility easy...nothing to do with performance. We are talking DC here.
Crees 72v was a fail for the same reason.
Notice nicha has also come down in voltage since their first gens.

It's a whole market demand. Not just a RIU thing.
 
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nevergoodenuf

nevergoodenuf

Well-Known Member
@Greengenes707 This is why I asked you about a 600 w 3 output driver in your other thread. The higher voltage and out put makes one driver per COB the easier chose for now. A good high output driver with multiple outs would make this better with the higher output COBs and some smaller builds.
 
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