Introducing CobKits.com - specializing in DIY and Citizen COBs
gazza2005au
Active Member
Has anyone mounted cob's directly to plate aluminium as a heatsink? shipping from the US to AU would be a stinger shipping the fin heatsinks as they are bulky but posting the 1212 CITI chips should be a fraction of the cost
i have 4mm plate aluminium and a couple 12cm computer fans for active cooling
this will be for my veg tent and running the 1212 CITI's at 35watts
any idea guys?
i have 4mm plate aluminium and a couple 12cm computer fans for active cooling
this will be for my veg tent and running the 1212 CITI's at 35watts
any idea guys?
gazza2005au
Active Member
Our shops over here want like $40 for basic CPU heatsinks that have the flat surface needed to fit the cob's, we are flooded with the cheap bowl shape CPU coolers but its really hard to find the square coolers and when u do find them they charge a fortune
i have a couple IceLED 450 heatsinks but one fan wore out within the first week of using it so i am kind of not wanting to trust them again
i have a couple IceLED 450 heatsinks but one fan wore out within the first week of using it so i am kind of not wanting to trust them again
CobKits
Well-Known Member
coreywebster
Well-Known Member
Why not order proper pin heat sinks and go passive from cutter.au?
https://www.cutter.com.au/search.php?pg=1&stext=pin+heat+sinks&sprice=&stype=&scat=&sfil0=&sfil1=&sfil2=&sfil3=&sfil4=&sfil5=&sfil6=&sfil7=&sfil8=&sfil9=&sfil10=&sfil11=&sfil12=&sfil13=&sfil14=&sfil15=&sfil16=&sfil17=&sfil18=&sfil19=
Sorry @CobKits not trying to do you out of some business in your own thread, it just makes sense.
gazza2005au
Active Member
I'm not buying just yet mate no funds after i just made a purchase but i have found Cutter to fly out of stock and takes weeks to get it back in and likely i will be broke again at that time
they had the fin heatsink in stock and within 24 hours i think around 30 pieces were sold and out of stock
SouthCross
Well-Known Member
Mr Cob. I've tried to find other places to beat your prices. I've looked deep enough straight back to the manufacturer. You're competitive as hell on the prices.
I'm in. Here's the order list. If I'm wrong on the set up, Please let me know.
Hlg-320h-48a. ( I don't want an external dim control)
4, Clu048-1818 90cri
4, 133mm sinks
4, arctic thermal pads
4, ideal holders.
I got enough wire and the bracket will be angle alloy from Lowe's. Don't want reflectors.
Mr Cob. I'm in Texas. I'm putting faith in decently cheap shipping from California.
Before I send the $$$. I'd like to ask what are the top two most popular color temperatures you sell on the citizen 48???
I'm in. Here's the order list. If I'm wrong on the set up, Please let me know.
Hlg-320h-48a. ( I don't want an external dim control)
4, Clu048-1818 90cri
4, 133mm sinks
4, arctic thermal pads
4, ideal holders.
I got enough wire and the bracket will be angle alloy from Lowe's. Don't want reflectors.
Mr Cob. I'm in Texas. I'm putting faith in decently cheap shipping from California.
Before I send the $$$. I'd like to ask what are the top two most popular color temperatures you sell on the citizen 48???
SSGrower
Well-Known Member
Your mom?
CobKits
Well-Known Member
welight
Well-Known Member
CK, what is your supply line normally like on the cmx 22?
Ive been waiting for a couple weeks for the bjb holders to get back in stock and notice your 3500k 90 cri is looking like it might be out before they come back in.
Id order separately but am a bit nervous on something coming in DOA (not saying because of you but shipping companies get pretty careless from time to time) and then eating the cost of a bunch of cobs because I couldnt test them as they came in.
If they do go OOS how long does your supply chain normally take to refill?
Ive been waiting for a couple weeks for the bjb holders to get back in stock and notice your 3500k 90 cri is looking like it might be out before they come back in.
Id order separately but am a bit nervous on something coming in DOA (not saying because of you but shipping companies get pretty careless from time to time) and then eating the cost of a bunch of cobs because I couldnt test them as they came in.
If they do go OOS how long does your supply chain normally take to refill?
SupraSPL
Well-Known Member
Hello COBkits, thank you again for all your hard work! I have a bunch of questions regarding the sphere tests if you have a minute, some I found the answers to in the earlier pages:
-Do these figures need correction based on the chips SPD and the li-cor's curve, or is the curve flat enough that it is not needed
-Which li-cor sensor was used
-Are those pulsed measurements or steady state, thermally stabilized (steady state right)
-If steady state, are they active or passive cooled (active iceled)
-did you start at the low currents or start at high currents? (low to high)
-What was the approx temp in sphere
-What method was used to monitor power consumption, or was it estimated based on the current
-Are driver losses included in the figures, if so what driver was used
I plan to run a few tests with the CXB3590 3500K CD and DB, the CXM22 and possibly Vero29 gen 7 for starters. Thank you for your time!
-Do these figures need correction based on the chips SPD and the li-cor's curve, or is the curve flat enough that it is not needed
-Which li-cor sensor was used
-Are those pulsed measurements or steady state, thermally stabilized (steady state right)
-If steady state, are they active or passive cooled (active iceled)
-did you start at the low currents or start at high currents? (low to high)
-What was the approx temp in sphere
-What method was used to monitor power consumption, or was it estimated based on the current
-Are driver losses included in the figures, if so what driver was used
I plan to run a few tests with the CXB3590 3500K CD and DB, the CXM22 and possibly Vero29 gen 7 for starters. Thank you for your time!
CobKits
Well-Known Member
its all relative. the licor is pretty flat but it cuts off steeply at 700 nm.
every chip in the test is 4000k 80 so not too much outside of 700. were assuming that the spd is similar for all of them. ive taken to presenting spectral readings with each test: https://www.rollitup.org/t/introducing-cobkits-com-specializing-in-diy-and-citizen-cobs.916763/page-107#post-13461197
i have the raw data if anybody wants to calculate QER
LI-190
i went thru the tests pretty fast. i doubt the sphere got more than a degree or two over ambient. the heatsinks were outside the sphere in ambient air, chip sticking inside the 2" port
voltage and current recorded from a Korad benchtop power supply
those are all gen3 CXM22, part number ending in -F4. significant spec jump over gen2 (-F3) so dont use those
cobkits,
i am looking to build a down and dirty fixture that will start in a 2x4 closet space
ive been researching alot but too many options and want to buy sooner then later.
was looking at citizen 1212 or Vero v22c for cheap price matched with a cheap CPU cooler.
but thought it would be better spend a bit more..
4 or 6 cob in a straight row
CXM22 3500k 90cri
133mm heatsink
driver suggestions? dimming for veg and cranked up for flower.
also would duplicate the setup and expand to 4x4 or 4x8 next run
i am looking to build a down and dirty fixture that will start in a 2x4 closet space
ive been researching alot but too many options and want to buy sooner then later.
was looking at citizen 1212 or Vero v22c for cheap price matched with a cheap CPU cooler.
but thought it would be better spend a bit more..
4 or 6 cob in a straight row
CXM22 3500k 90cri
133mm heatsink
driver suggestions? dimming for veg and cranked up for flower.
also would duplicate the setup and expand to 4x4 or 4x8 next run
Just wanted to give a big shout-out and thanks to CobKits for helping me get an order underway.
Ill be sure to post some pics once its done, but it will be a box style (semi active) and shall be running ( 8 ) cxm 22 3500k 90cri, and (4) of the same at 80cri in following format
8 9 8
9 9 9
9 9 9
8 9 8
pushed by 3 hlg 240 54a @ 4 cobs each with "zone control" switches (these may eventually get a 5th cob each in the future as this is a prototype for a good friend and had to meet budget i was given to build)
Ill be sure to post some pics once its done, but it will be a box style (semi active) and shall be running ( 8 ) cxm 22 3500k 90cri, and (4) of the same at 80cri in following format
8 9 8
9 9 9
9 9 9
8 9 8
pushed by 3 hlg 240 54a @ 4 cobs each with "zone control" switches (these may eventually get a 5th cob each in the future as this is a prototype for a good friend and had to meet budget i was given to build)
Just to confirm the bjb 319.2033 holders will allow clearance for a m4 screw? I know Ive read that a few times in this thread/elsewhere that the screws used are m4 but also checking the spec sheet for bjb shows m3 screw. (just making sure ideal isnt only holder that works with that size)