Luminus CXM-32 Gen3 the next big thing??
- Thread starter bassman999
- Start date
CobKits
Well-Known Member
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
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
Forgot citizen had new cobs out soon. Can't wait.
Fastslappy
Well-Known Member
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 ?
as what if the difference is minimal? & they are no cheaper than a current gen cities ?
CobKits
Well-Known Member
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
bassman999
Well-Known Member
Cree still charging high for old tech, I doubt their new stuff will be competitive price wise, and probably not worth waiting for.
CobKits
Well-Known Member
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
bri77
Well-Known Member
A few more incremental changes and we'll some crazy fixtures built.
CobKits
Well-Known Member
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
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
bri77
Well-Known Member
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.
You'd end up with top notch fixtures were the chips are like 15% of the total cost.
CobKits
Well-Known Member
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
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
muleface
Well-Known Member
where did you get this lovely calculator?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...
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
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