Introducing CobKits.com - specializing in DIY and Citizen COBs

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camdengolf

Well-Known Member
I am excited to test out the setup I bought. From research, I ended up buying from cobkits.com got enough gear I believe to hook up 5 citizen 1212's. I read on website to ask if not certain how to hook these up so I don't burn them out, so I do want to ask if ya'll can direct me where I need to read or what to do just to be certain I have it right. So my setup is this as I am intending for veg light setup;
I bought:
5 citi 1212's- four 6500k and one 4000k
5 mechatronics 111mm heat sinks
5 arctic thermal citizen pads
5 ideal holder for citizen
5 reflectors to match holder
5 Ideal 50-2100AN reflector adapter
1 MeanWell HLG-185H-48A Driver
1 five pole pluggable terminal
all this was purchased from CobKits.com and I am simply wondering like what wires I need to get and where I can buy such stuff. I understand how to put it together. Also, what should I do for mounting and cooling for these?
 
Big smo

Big smo

Well-Known Member
I had a thought. Maybe cobkits could do a basic video and link it to his website. Might bring in more traffic and also ease the minds of unsure diy'ers or future diy'ers.
 
CobKits

CobKits

Well-Known Member
Big smo said:
I had a thought. Maybe cobkits could do a basic video and link it to his website. Might bring in more traffic and also ease the minds of unsure diy'ers or future diy'ers.
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appreciate the thought just trying to keep up with everything right now. if i make a big screen debut you'll be the first to know about it. people want kits (and as mentioned we are cobkits afterall) so its inevitable

weed-whacker said:
so you are suggesting that this graph is accurate?
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as accurate as i could measure. the bumps are rounding errors and the one 100V cob on there (GT3838-164) id give +/- 2% on confidence as its a different power supply. the rest were all measured under same conditions except the 1212 and the gt2828s were all on 111mm heatsinks vs the 140s all the others were on. 120mm fan ripping straight down on them, most were cool thru the whole test so should be minor bias. in the past ive seen less than 1% "droop" at high currents at (my best attemptat ) pulse measurement vs. steady state. under this test, in this cases most chips would be affected equally

weed-whacker said:
so the 1212 @ 30w is equally as efficient as the cxb3590 @ 50w?
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35W prob closer to 40W if that were an 80 cri cree
weed-whacker said:
and if i run it at 25w it's 65% eff?
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my best estimate when normalized to the CXB efficiency numbers (DB bin 60% at 35% eff per "the spreadsheet":

upload_2016-9-11_18-23-51.png
 
The Dawg

The Dawg

Well-Known Member
Their Called CCS Which Stands For Cree Cob Snobs And They Lack Imagination And They Are A Monkey See Monkey Do Type of Grower. They Are Also The Type Of Ppl Likely To Walk Off A Cliff While Taking A Selfie Just Saying If The Truth Hurts Then Don't Fool Yourself Cause Its Winking At You :hump:
 
CobKits

CobKits

Well-Known Member
sixstring2112 said:
how many citi's would it take to do a side by side with my 15 x 3590 cree bars driven at 1050ma ?
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based on my most recent measurements, my best guess would be:

if you replaced those 15 crees with 15 1825s (same cost) you would have the same amount of light and increase your efficiency from ~59.4 to ~63%

if you replaced those 15 crees with 15 1818s at 2/3 the price you would have the same amount of light and increase your efficiency from ~59.4 to ~61.2%

if you replaced those 15 crees with 15 1212s at 1/3 the price you would have the same amount of light and cut your efficiency by 3%

if you replaced those 15 crees with 20 1212s at 40% the price you would have the same amount of light and same efficiency
 
Airwalker16

Airwalker16

Well-Known Member
CobKits said:
based on my most recent measurements, my best guess would be:

if you replaced those 15 crees with 15 1825s (same cost) you would have the same amount of light and increase your efficiency from ~59.4 to ~63%

if you replaced those 15 crees with 15 1818s at 2/3 the price you would have the same amount of light and increase your efficiency from ~59.4 to ~61.2%

if you replaced those 15 crees with 15 1212s at 1/3 the price you would have the same amount of light and cut your efficiency by 3%

if you replaced those 15 crees with 20 1212s at 40% the price you would have the same amount of light and same efficiency
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Huh?
 
CobKits

CobKits

Well-Known Member
which part is unclear? im my test setup
at 1050 mA cree = ~335 umol @ 36W, 59.4% eff
1825 =~335 umol @ 34.3W, ~63% eff
1818 = ~335 umol @ 34.9W, ~61.2% eff
1212 = ~335 umol @ 37.7W ~ 56.2% eff
1212 = ~225 umol @27W, ~59.4% eff (but you need 20 of them vs 15 to match OG PAR)
 
JorgeGonzales

JorgeGonzales

Well-Known Member
weed-whacker said:
then whats up with this chart? is it off? are the LER numbers correct at least correct(the L per watt are a bit low than the citiLEDselection excel) ?
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That chart and @CobKits testing have almost nothing to do with one another, both are "correct".

Although I am unclear how @CobKits is getting percentages out of spot PPFD measurements, unless it's just relative to Cree. Big-assed grain of salt if that is true.
 
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