Luminus CXM-32 Gen3 the next big thing??

Do these look like they're worth getting excited over? Starting another cob grow in the spring

Surprised Cree hasn't came out with anything else yet...

well i wouldnt call them game changing. everything from here on out will prob be incremental until the variable cct cobs catch on.

remember citis got a new gen due in a month or two as well, with a few % boost so they'll be right there with the luminus. price really dictates whats best. its great that (with the cxm22) we have cxb equivalent cobs under $20 when that level of tech was $50 this time last year. i still think they are better all around for our applications unless youre one of the megawatt guys

CobKits said:

well i wouldnt call them game changing. everything from here on out will prob be incremental until the variable cct cobs catch on.

remember citis got a new gen due in a month or two as well, with a few % boost so they'll be right there with the luminus. price really dictates whats best. its great that (with the cxm22) we have cxb equivalent cobs under $20 when that level of tech was $50 this time last year. i still think they are better all around for our applications unless youre one of the megawatt guys

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Forgot citizen had new cobs out soon. Can't wait.

Im still waiting to order the news citizens

I was waiting cree , waiting is flawed ,price point & time loss
as what if the difference is minimal? & they are no cheaper than a current gen cities ?

Fastslappy said:

I was waiting cree , waiting is flawed ,price point & time loss
as what if the difference is minimal? & they are no cheaper than a current gen cities ?

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cxm22 is both brighter and cheaper than its closest match 1818
when new gen6 1818 come out they might catch up with cxm22, but will still be more expensive

i plan on replacing my 1818s with cxm22

i will still stock 1212s, as there is no match for those in that price range and they are about to get even better

Cree still charging high for old tech, I doubt their new stuff will be competitive price wise, and probably not worth waiting for.

Fair enough, I'll wait for citizen and the cxm22's test results and data. Look promising!!

it will be interesting. aside from flux the biggest citi change from 5 to 6 is better thermal management, which means the efficacy curves should "flatten" and 1825 and 3618 should continue to dominate the high wattage realm above 150 W/chip. also they are allowing up to 150 Tj so go ahead and bang on those chips

CobKits said:

well i wouldnt call them game changing.

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A few more incremental changes and we'll some crazy fixtures built.

well the biggest thing is cost. when you can buy a chip that costs half as much as the $50 CXBs of a year ago, and its the same efficiency at 60-70W that we were getting at 50, that reduces your build substantially. bettter thermal management allows for cheaper heatsinks and longer lumen life, etc.

what people were building DIY ffor $3 a watt will now be much ore efficient. that plus better techniques/genetics/nutes/media means 2GPW should be the new standard in a little while

thats another reason i like the cxm22. the 22mm les on a 28mm chip is a super common platform that you can bet will be around for awhile, so a few years from now, you can upgrade to luminus gen 5, citi gen 9, getians latest, etc etc.... it has many holder and reflector options

The "Relative Output Flux vs. Forward Current" graphs in the cxm datasheets look very linerar compared to others, cree especially. Am I eyeballing them wrong, or should we be driving these hard regardless of chip cost?

You'd end up with top notch fixtures were the chips are like 15% of the total cost.

any chip is always more efficient at low currents as well as lower temps

this might help

https://www.rollitup.org/t/why-are-cobs-better-and-whats-so-great-about-the-3590.920480/#post-12944216

but yes, as you say, chip cost as a percentage of overall cost is dropping

a good rule of thumb is at a given total wattage, if double your chip cost (and heatsink cost and holder cost, etc), you will increase your efficiency by about 10%

ie, 20 chips at 700 mA is 10% more efficient than 10 chips at 1400 mA, but costs twice as much

@CobKits When do you anticipate being able to ship the preordered CMX engines?

hope to knock out all engines by the weekend. its first in first out and i just got my shipment of 3618s so those are ahead in the queue

the cxm passives are easy i hope that once i get caught up i can build a bunch out and have ready-to-ship kits

Nice and forgive my ignorance but why is the verbiage (370W) used in the title of the preorder page?

oh wow! major website error! the cxm22 ate my 3618 preorder page.. thanks for the heads up. i tried to duplicate that listing and must have overwritten it

All good, ok cool. If you plan to offer a 3 CMX kit what driver/wattage might we be looking at? I'm two weeks away from flower and would love to get them in as supplemental lighting this cycle.

Ganjineer said:

I quickly digitized the spectral distribution. According to my PSQC calculator the CXM-22 3000k 80CRI has a LER of 323 lm/W. This spectrum is identical to the CXM-32 3000k.

See the output from the calculator below...

Click to expand...

where did you get this lovely calculator?

So I run my COBs pretty hard, Vero 29s at 80 watts each. I get 4 cobs to a 320-2.1a driver.

Can someone explain why i would want to run 8 cobs at 40 watts instead of 4 cobs at 80 watts?
I'm not trying to start a "tastes great, less filling" type of argument, I am just needing build out the second half of a 4x8 tent, and and trying to figure out if I want to go with 8, 12 or 16 cobs

it would be 10% more efficient and possibly yield more and/or save electicity and heat depending on your setup