Introducing CobKits.com - specializing in DIY and Citizen COBs

pop22

pop22

Well-Known Member
Well.... I got them free lol! And the heatsinks, lenses. It was Northern Grow Lights sponsored build I bought the drivers and that frame, etc.
So I can't complain, its a good light. Maybe I'll just turn it up a bit and run it another year. have to think on it.
CobKits said:
1825s are pretty good in terms of efficiency, esp at 75W. i still have a tent on those

thats kinda the problem of the larger cobs, they are not as standard, where the 28mm cobs are all bolt-in replacement

cxm32s are the same size and voltage as your cobs. ive been leery to stock those as the larger cobs simply dont sell as well, and theri advantages over a cxm22 at the wattages we normally run dont really justify the price difference, imo
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L

leblanca

Member
Hi @CobKits have you had any experience with the luminusCXM-22-HM-61-54-AC30?
I am putting together a 32 cob array and have bought everything else than the chip im just hesitating between 2 chip as the gen 4 put out more mole/s at 130 but the hortilum put out 110 mole/s for the same power used, so the gen 4 would be better right?
Well i asked Luminus and they recommended me the hortilum HM over the gen4 chip of same size to grow cannabis, they say the spectrum is optimized for plant grow giving more energy where it needs to be.
So whats your take on this?
top graph is gen4, bottom is hortilum.
Untitled.png
 
L

leblanca

Member
Airwalker16 said:
If it's strictly for flowering, the 2700k gen 4 is a way better spectrum.
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Its for both, the spectrum of the 2700k is the strongest between 580 and 630 nm, the spectrum of the hortilum is strongest between 610 and 660 nm so both have a peak equal to about 50 nm but the hortilum is more in the red spectrum and the gen4 is more in the yellow orange than red.
download.jpg

So that make me wonder, why do you think the 2700k would be better? more energgy focus only in the close to red spectrum?
 
CobKits

CobKits

Well-Known Member
i personally find 2700 is too far in the red (unless youre using it to supplement)

i can actually shoot the 3000 and 3500k luminus with the meter if you wish
 
bleak

bleak

Well-Known Member
Hi! One of my fans on my Cob-Kits light needs replacing. Its an unusual mount, different to most PC fans, so I'm not sure what to look for. Could someone please let me know what type/model/size of fan this is? I've attached a few photos. Thanks in advance :clap:

IMG_0109.JPGIMG_1636.JPG
 
S

SDS_GR

Well-Known Member
Can you measure the diameter of the rotor ? Me thinks it’s 80 mm .
Those mounting holes look pretty standard to me .
 
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bleak

bleak

Well-Known Member
Thanks everyone for the help so far.

CobKits said:
as far as i know the fans for mechas are unique

how old is it?
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So the fan is a Mechatronics brand?

It was purchased in 2016.

Airwalker16 said:
Fan selector on the left side.

AC Fans, DC Fans and Blowers, Fan Accessories from Mechatronics, Inc.

Your leading source for AC and DC brushless axial cooling fans, fan filter assemblies, fan accessories, power cords
www.mechatronics.com
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Any chance you (or anyone) could help me narrow it down? I'm not knowledgeable enough to use the Fan Selector tool.

From the first dropdown in the Fan Selector, I'm assuming I need "AC Low Power", is that correct?

The second dropdown is voltage (115v versus 230v). I was under the impression PC fans were 12v. I live in Australia (230v), but purchased the lights from USA (115v). So I have no idea which voltage to select, or if it even matters?

Third dropdown is airflow. Once again, I wouldn't have a clue how much airflow the existing fan has, or how much airflow is required for a COB fan.

Fourth dropdown is case size. I've measured the physical size of the fan and its 94mm wide (including the housing). The closest option from the selector is 92mm.

SDS_GR said:
Can you measure the diameter of the rotor ? Me thinks it’s 80 mm .
Those mounting holes look pretty standard to me .
Click to expand...
I just measured the rotor, its 85mm wide (give or take 1mm, as the ruler doesn't quite fit inside the housing)

Maybe I'm confused about what "standard" mounting holes are - Could that depend whether we're talking PC's, or COB's?

I'm coming from a PC-building background. With every single PC fan I've seen, the mounting holes are on the outside corners of the housing, nowhere near the rotor. Totally different to this fan, where the mounting holes are on the "ribs" of the fan, behind the rotor. I've uploaded an image to clear this up.

Thanks again everyone who has offered suggestions. Hopefully together we'll get to the bottom of it! For now I'm running the COB on minimum power to avoid overheating.

Video-thumbnails.jpgIMG_0109.JPG
 
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Airwalker16

Airwalker16

Well-Known Member
bleak said:
Thanks everyone for the help so far.



So the fan is a Mechatronics brand?

It was purchased in 2016.



Any chance you (or anyone) could help me narrow it down? I'm not knowledgeable enough to use the Fan Selector tool.

From the first dropdown in the Fan Selector, I'm assuming I need "AC Low Power", is that correct?

The second dropdown is voltage (115v versus 230v). I was under the impression PC fans were 12v. I live in Australia (230v), but purchased the lights from USA (115v). So I have no idea which voltage to select, or if it even matters?

Third dropdown is airflow. Once again, I wouldn't have a clue how much airflow the existing fan has, or how much airflow is required for a COB fan.

Fourth dropdown is case size. I've measured the physical size of the fan and its 94mm wide (including the housing). The closest option from the selector is 92mm.



I just measured the rotor, its 85mm wide (give or take 1mm, as the ruler doesn't quite fit inside the housing)

Maybe I'm confused about what "standard" mounting holes are - Could that depend whether we're talking PC's, or COB's?

I'm coming from a PC-building background. With every single PC fan I've seen, the mounting holes are on the outside corners of the housing, nowhere near the rotor. Totally different to this fan, where the mounting holes are on the "ribs" of the fan, behind the rotor. I've uploaded an image to clear this up.

Thanks again everyone who has offered suggestions. Hopefully together we'll get to the bottom of it! For now I'm running the COB on minimum power to avoid overheating.

View attachment 4582164View attachment 4582179
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Any way you could just use the housing on a new working fan maybe? Or find one with thick enough "ribs" to drill holes into?
 
bleak

bleak

Well-Known Member
Airwalker16 said:
Any way you could just use the housing on a new working fan maybe? Or find one with thick enough "ribs" to drill holes into?
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I hadn't thought of drilling my own mounting holes, great suggestion :clap: You got me thinking, even if the ribs aren't thick enough for drilling, I could probably find another way to attach it (eg. some thin wire). I'll keep that in mind as a backup, in case I can't find a replacement fan.

As for using the old housing on a new fan - Unfortunately it seems like theres no way to seperate the housing from the fan. I pulled the sticker off and theres no screws, nuts or anything that can be removed. I also tried just manually pulling the fan off the housing (with a reasonable amount of force) and it seems to be glued on :( If anyone has any tricks or suggestions I'm all ears.

Really appreciate the forums help.
 
Airwalker16

Airwalker16

Well-Known Member
bleak said:
I hadn't thought of drilling my own mounting holes, great suggestion :clap: You got me thinking, even if the ribs aren't thick enough for drilling, I could probably find another way to attach it (eg. some thin wire). I'll keep that in mind as a backup, in case I can't find a replacement fan.

As for using the old housing on a new fan - Unfortunately it seems like theres no way to seperate the housing from the fan. I pulled the sticker off and theres no screws, nuts or anything that can be removed. I also tried just manually pulling the fan off the housing (with a reasonable amount of force) and it seems to be glued on :( If anyone has any tricks or suggestions I'm all ears.

Really appreciate the forums help.
Click to expand...
If it's actually glued, heat it up with a heat gun and it'll separate easily.
 
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