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Topic # 86956 15-Jul-2011 20:52
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I'm looking for an aluminum 25cm by 100cm heat sink with 2.5cm fins.

This is actually for some 50W LEDs but I thought this was the best place to post because desktops use heat sinks.

What my question is, is there anyone in NZ that supplies heat sinks such as the one mentioned above?
I can get one from the states for $300 so if anyone knows someone cheaper in NZ please post them!

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Stu

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  Reply # 493860 15-Jul-2011 21:27
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Have you tried Jaycar? http://www.jaycar.co.nz/

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  Reply # 493861 15-Jul-2011 21:32
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Have you tried a non ferrous metal supplier for some aluminium extrusion? That or an electronics repair place who might have some heat sinks from discarded kit.

I know I've got some around, but the box of junk is 12,000 miles away - sorry

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  Reply # 493863 15-Jul-2011 21:34
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Hey,

I have used element14 quite a bit. Just don't believe their stock listing.

http://nz.element14.com/led-heat-sinks


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  Reply # 493876 15-Jul-2011 21:58
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Did someone buy a 50W LED from Deal Extreme? ...mine arrived a few weeks ago... and I added a large CPU heat pipe heatsink to the order. You still need to make an adapter plate, because CPUs are a little bit smaller than 50W LEDs.

A heat pipe heatsink is your best bet, and you need the fan. Better still, underdrive the LED. With the last bit of current the efficiency tapers off anyway, and trust me a 50W LED is too bright for most applications. Even looking at a 10W is blinding. I'll be trialling my 50W for stage lighting once I get a chance on the company milling machine - but drinking coffe over break times is so much more appealing. Also got a few other LED strips for our new home.

You can run LEDs at 70 degrees, but best to keep them at 50 max.




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  Reply # 493881 15-Jul-2011 22:11
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Gosh! Its nice to see an active forum for a change Laughing

I'm going to Jaycar tomorrow and will try Stewarts as well.

Thanks for the suggestions, keep em comin! If a visual representation of what I'm looking for helps, this is what I'm looking at in the states: http://www.heatsinkusa.com/productimage.php?product_id=501

gzt

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  Reply # 493886 15-Jul-2011 22:40
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Ullrich sell it by the meter, but you will have to call them to see what is in stock. Most likely a minimum purchase length will apply, like five meters or so.

http://www.ullrich.co.nz/pdfs/extrusion/11-Heatsinks.pdf

If your requirements are huge, they will manufacture of course : )



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  Reply # 494142 16-Jul-2011 21:37
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gzt: Ullrich sell it by the meter, but you will have to call them to see what is in stock. Most likely a minimum purchase length will apply, like five meters or so.

http://www.ullrich.co.nz/pdfs/extrusion/11-Heatsinks.pdf

If your requirements are huge, they will manufacture of course : )

Thank you! They have exactly what I need :D

Lol, 5 meters of heatsinks will last me a looooooong time

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