Luminus CXM-32 Gen3 the next big thing??
- Thread starter bassman999
- Start date
CobKits
Well-Known Member
temperatures are whatever they are.
75C on that vs 75C on a pinfin is the same to the chip
Buuuut the pin fin would run cooler giving higher (maybe relatively?) Efficiency?
Not criticizing just asking a question. These intrigue me.
CobKits
Well-Known Member
pin fin isnt gonna run cooler than me testing these at 20-40C i do 10 measurements in under 2 minutes the block barely has time to heat up. for higher currents i can 'punch in' on a cold plate as needed. idea is to be temperature independent for these, temp droop is a whole different series of tests.
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Warpedpassage
Well-Known Member
Wow, thank you for sharing cobkits. Its cats like you that make these forums worthwhile.
So if im understanding the graph for cxm22, there is not much reason for me to run 6 cxm22 over 6 sqft at 35watts. I can stick with just 4 cxm 22s over 6 sq ft running at about 50 wAtts a piece. It looks like there isnt much of a gain in efficiency going from 50 watts to 35 watts to justify the cost of two extra engines?
So if im understanding the graph for cxm22, there is not much reason for me to run 6 cxm22 over 6 sqft at 35watts. I can stick with just 4 cxm 22s over 6 sq ft running at about 50 wAtts a piece. It looks like there isnt much of a gain in efficiency going from 50 watts to 35 watts to justify the cost of two extra engines?
CobKits
Well-Known Member
depends on your setup. if youre not space limited, 6.5% more PPFD at a given wattage should yield about 6% more product... every 2-3 mos. adds up quick.
also that graph kinda assumes temps are similar. if you were using the same cooler for both setups you might have as much as an 8%+ advantage as the cob at 50W would run a little hotter
also that graph kinda assumes temps are similar. if you were using the same cooler for both setups you might have as much as an 8%+ advantage as the cob at 50W would run a little hotter
bassman999
Well-Known Member
This is why I run extra cobs at lower driver current!!
Warpedpassage
Well-Known Member
I have been going back and forth between 4 cobs or 6. After your feedback i will go with six. You are absolutely correct that if i can get that higher efficiency translated into more flowers it will pay off in the long run. There have been occasions in the past few years where for health and other familial obligations i only get one to two grows a year. Having an extra 8% yield would have helped immensly during those times when jars were running dry and waiting on a harvest.
emepher
Well-Known Member
Not to clutter up the thread, but you've got to hand it to CobKits for not just coming heer to sell shit, but really putting in incredible work to help us make truly informed decisions. Great resource for parts AND information. There are lots of other folks who go way out of their way for us here, but I've got to give props where due, and these CXM's are pretty intriguing. I heart new technology, and this community.
CobKits
Well-Known Member
i appreciate the kind words but im just here to learn like everybody else, and paying forward what you've learned already is part of that process
a lot of people have written off this board as being past its prime but i think theres still a lot of great info being shared here
a lot of people have written off this board as being past its prime but i think theres still a lot of great info being shared here
sixstring2112
Well-Known Member
i guess i wonder if you can keep them so cool it will pay for the fans to run?
I would imagine no. But a few extra Watts to keep them alive longer is the goal.
If the setup becomes more efficient, obviously a plus. I'm sure when you're running hot, you'll gain from cooling, but if it's already cool, running cooler I won't imagine will help.
Diminishing returns I guess I'm trying to say.
sixstring2112
Well-Known Member
how hard do you plan to run the cobs? unless your pushing rated power or more and/or using a heatsink thats undersized the cob should last much longer than expected lifespan.
Between 700-1400ma I think. I plan on buying 5-6 cxm22s, and mount them on 163mm pin fin heatsinks in a 4x3x7ft closet. Probably 1400ma to get the proper PPFDs needed I think.
I'm actually thinking I just won't bother with the fans, and just get 2 Honeywell ht-900's on low for really good airflow. I'll have one mounted above the canopy, and one below on opposite sides for kinda a tornado effect.
Grow room won't be sealed but it is in a closet, so it should still passively exchange air from the surrounding rooms I'm thinking? I don't want to deprive CO2.
sixstring2112
Well-Known Member
yeah 50w on a 160mm heatsink wont bother those chips none,i would not worry about extra cooling.just normal grow room air movement will be plenty
What are the most efficient fans to circulate air in a grow room? I want to buy 2.
Looked at the Honeywell HT-900, Which is cheap and works well, but then I saw the Dyson AM06, and it uses a fraction of the power while being quieter and moves more air.
One being $15, the other $300. There a better compromise? Would 2 Noctua 3000rpm NF-A14's PC fans be more efficient?
Looked at the Honeywell HT-900, Which is cheap and works well, but then I saw the Dyson AM06, and it uses a fraction of the power while being quieter and moves more air.
One being $15, the other $300. There a better compromise? Would 2 Noctua 3000rpm NF-A14's PC fans be more efficient?
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sixstring2112
Well-Known Member
think i saw @Growmau5 using ceiling fans to move room air @ like 35w per fan.thats pretty dang good for a bigger fan