What Heatsink need to working cob citizen?

HempStone

HempStone

New Member
Hi i need your help

I need to know what heatsink need for working cob citizen 1212 , i have already the drivers, cobs an other components

The cobs i think to work max 40 W
 
wietefras

wietefras

Well-Known Member
I wouldn't push a Citizen 1212 to 40W. They are more suitable to 15W to 20W. if you want good efficiency that is.

I mounted my COBs running at 15W to a standard aluminium bar. Six COBs per bar. Sort of created a COB LED strip. Buying led strips would be easier/better I guess, but if you insist on COBs.
 
M

mooray

Well-Known Member
I don't have efficiency data, but emailing cobkits it sounded like they were great at 50w and above that is when the efficiency starts to go downhill.
 
HempStone

HempStone

New Member
mooray said:

133mm Passive Pin-fin heatsink (for CLU048/CXM22/Vero 29) – CobKits.com

cobkits.com cobkits.com
Click to expand...

Thank but i am in Europe

wietefras said:
I wouldn't push a Citizen 1212 to 40W. They are more suitable to 15W to 20W. if you want good efficiency that is.

I mounted my COBs running at 15W to a standard aluminium bar. Six COBs per bar. Sort of created a COB LED strip. Buying led strips would be easier/better I guess, but if you insist on COBs.
Click to expand...

I see in other post people and stores using this cobs 50 W and 40W , you have efficacy table

Airwalker16 said:
Are these CLU048-1212?
Click to expand...

Yes they are Cobs Citizen Clu048-1212
 
wietefras

wietefras

Well-Known Member
So for that 90 CRI model you get 2.11 umol/J @ 50W. Will be a few % more for the 80 CRI and a few percent extra for the gen 6. Still, with led strips and rectangular boards, people tend to be looking for around 2.5umol/J and up.
 
topcat

topcat

Well-Known Member
HempStone said:
Hi i need your help

I need to know what heatsink need for working cob citizen 1212 , i have already the drivers, cobs an other components

The cobs i think to work max 40 W
Click to expand...

MechaTronix MODULED MEGA 13450-B

MechaTronix MODULED MEGA 13450-B Modular LED Star Cooler for low and high bay designs from 5,500-11,000 lm; ø134mm x H50mm; Rth 0.88°C/W; Mounting holes for Zhaga book 3 LED module & 36 mounting holes for all LED COB brands; Black Anodized
www.led-heatsink.com www.led-heatsink.com
 
Rocket Soul

Rocket Soul

Well-Known Member
There is a sortof backwards benefit to running leds with little heatsinking: you forced to run them soft which means they give more efficiency and also you need more chips for same watts which means better spread.
 
HempStone

HempStone

New Member
coreywebster said:
Have you considered strips instead of COBs or have you bought them already?
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Thanks, i prefer the cobs because easier to find and it is cheaper what de Strip, and the result is they are very similar

1 panel 50 W cobs Citizen or Cree it cost me about 30 Euros and 1 panel strip 120 w it cost me about 150 euros
 
coreywebster

coreywebster

Well-Known Member
HempStone said:
Thanks, i prefer the cobs because easier to find and it is cheaper what de Strip, and the result is they are very similar

1 panel 50 W cobs Citizen or Cree it cost me about 30 Euros and 1 panel strip 120 w it cost me about 150 euros
Click to expand...
I think your wrong there. But I missed the part where you stated you already have the COBs.

Strips are way cheaper and some can be mounted to simple U aluminium angle.

Anyhow, anything useful here

Possibly all to small?

I know primelight are a uk distro for citizen and two years ago they told me they were stocking heatsinks for all the citi cobs, however they still have not updated the website to reflect this but you could email them and ask.
 
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