I highly recommend Arctic Alumina thermal adhesive.  You can get it through=
 Walmart.com about the cheapest, and can even pick it up at your local stor=
e.  Otherwise plain old thermal compound and screws works.
Cheers,Robert

> Date: Thu, 15 May 2014 14:52:55 +1000
> Subject: [EE] Heatsinking LEDs
> From: kresho@gmail.com
> To: piclist@mit.edu
>=20
> Hello list.
>=20
> I'm working on a little job that requires some hefty light output (around
> 1500lm) and I'm looking at using 8x LXML-PWC2 Lumileds mounted on a small
> Al backed PCB about 40mm (~1.6") diameter. This will be enclosed in a
> small, sealed Al case (with a glass window of course!) and I'm wondering
> now how best to transfer heat from the LEDs to the outside world.
>=20
> I was intending to mount the PCB onto an Al structure that is firmly
> connected to the case in order to transfer the heat. I'm now wondering if
> anyone can recommend an adhesive that is good for up to (say) 150degC and
> has good thermal transfer properties that I can use to attach the PCB? Or
> some other method of bonding like screwing it down and using a thermal
> transfer compound?
>=20
> Any experience or suggestions most appreciated.
>=20
> Thanks.
> Kris.
> --=20
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