Introducing CobKits.com - specializing in DIY and Citizen COBs

S

Silver or lead

Well-Known Member
Thank you.

Hopefully when people search this particular driver this thread comes up. I did a lot of searching and couldn't get a definitive answer. I know it was answered in this thread but I already have days into searching out the best lights.

Maybe you could clarify this on your website since it is so contrary to common wisdom.

And holy, that thing was like looking at an arc welder.
 
CobKits

CobKits

Well-Known Member
ok ill put parallel on the page in big bold letters

i wouldnt say its contrary to common wisdom, if you understand cob and driver voltage its relatively fundamental. i sell more of the constant voltage drivers than constant current actually

but yeah, i need some faqs up there!
 
S

Silver or lead

Well-Known Member
I got it rewired and all is working well. It really is amazing how bright only 100 watts can be.

On last question for now. How efficient is this setup? How many lumens/watt is it putting out. I tried doing the calculator but I only have a phone to work with and it just didn't work for me.
 
Walterwhiter

Walterwhiter

Well-Known Member
VenomGrower6990 said:
Lol Right!! I have 10 cobs now for my canopy 10 Citizen build i am doing that will be powered by 2 HLG240h-c1050b drivers with dimming. Been saving and planning this for months and i am getting super excited now. Ordering the aluminum tomorrow. Getting closer.
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1818s? I got 4 140 heatsinks and holders from northern and wiring and artic paste. just short 4 cobs aND a driver.
Well double to replace my 600w
 
VenomGrower6990

VenomGrower6990

Well-Known Member
Walterwhiter said:
Your doing that gowmau5 open source deal right?
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Kind of but not the same elaborate build he did with the Cree. Mine will be the budget model with just aluminum L channel. The 80/20 he used is really not that bad on price but once you add the special cut plates for the 10 cobs it jumps up to $200 real quick just for the frame materials. Its a little over $100 to have 10 of those special plates cut from an online machine shop. Mine will be built for a 3x4 space not the 4x4 he did. I dont have room for a 4x4.
 
Ganjineer

Ganjineer

Member
CobKits said:
the photodiode installed on the sphere would normally be read by a picoammeter (basically a benchtop ultra-precision low-current ammeter). It has a BNC and i tried to hook it up to my Li-Cor meter and it read, but read negatively (probably could be fixed with a polarity swap), but it pinned it. possibly resolvable with entering a new constant, and/or addign a resistor in line.

ultimately calibrating the ocean optics USB-2000 (similar to this but mine is the older "non +" model)
using this) is what id like to do as it will give us more data, as the licor has a sharp cutoff at 700 nm.

for now i think i will figure out how to mount the li-cor in there, which is somewhat calibrate-able as i have the constant from a semi recent (this decade) calibration:

https://www.licor.com/env/support/cal/2012-04/instruments/Q45044.pdf

what would be awesome is if anybody with a 3D printer could make me some mounts for these sensors. anybody up for it?
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I have access to a 3D printer. If you have a model I can print it, or I can help you cad it up.
 
M

MACDRIZZLE

Member
Mrherbal said:
Could I power 10 clu048 1212's with a meanwell hlg 240h 700b driver??
Thanks
Click to expand...
Yeah, 10 is perfect for that driver and the most you could do.
Using this calculator: http://ce.citizen.co.jp/lighting_led/en/products2/notice_Simulator_ver5.html
I set it to the 3500K, 80 Min, CLU-048 1212
I found that at 700mA(drivers max current) each cob would be at 34.6 volts
Driver can hold a max of 357 volts, so 357/34.6 = 10.3 COB's, so at full current it would be 242 watts at the wall.
I was planning on doing something similar. Good Luck!
 
M

Mrherbal

Member
MACDRIZZLE said:
Yeah, 10 is perfect for that driver and the most you could do.
Using this calculator: http://ce.citizen.co.jp/lighting_led/en/products2/notice_Simulator_ver5.html
I set it to the 3500K, 80 Min, CLU-048 1212
I found that at 700mA(drivers max current) each cob would be at 34.6 volts
Driver can hold a max of 357 volts, so 357/34.6 = 10.3 COB's, so at full current it would be 242 watts at the wall.
I was planning on doing something similar. Good Luck!
Click to expand...
Thanks Bud!!... :)
 
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