Calling out to Weezard for LED advice

Quote:

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Originally Posted by Weezard

That's what I ended up doing on one of the arrays.
Used dropping resistors.:(

The laptop supplies are excellent and can mount piggyback on the 'sink.
Hope ya no mind if a watch.

Aloha,
Weeze

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Just don't use HP laptop power supplies, they get way too hot.

Even this 65w power supply next to my DV7 is keeping my sake VERY warm.

Anyone have a different source for those thermal pads Luxeon sells? Everything else is here or on the way other than I need to buy some wire.

I got this...SEKISUI 5760 Dbl Sided Thermal Tape

I would recommend against thermal pads, and I would use a true thermal adhesive.

Arctic Silver works great.

Have you used the thermal tape?

How does it not fall into the "true thermal adhesive" category since that is the exact reason it is manufactured?

Quote:

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Originally Posted by mx4intx

How does it not fall into the "true thermal adhesive" category since that is the exact reason it is manufactured?

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Thermal conductivity, number one reason.

Thermal pads/tape are notoriously bullshit, and very low TC.

I have seen it recommended for high powered LEDs in threads just like this one. More than once. This was based on the heat transfer and the fact that you can remove the led's much easier than you can with epoxy.

I also just found a thread abount the AS adhesive compared directly to thermal tape at overclockers cafe. The tape wasnt too far behind in my opinion. Especially for this application.

I guess I will just have to see for myself.

Quote:

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Originally Posted by mx4intx

I have seen it recommended for high powered LEDs in threads just like this one. More than once. This was based on the heat transfer and the fact that you can remove the led's much easier than you can with epoxy.

I also just found a thread abount the AS adhesive compared directly to thermal tape at overclockers cafe. The tape wasnt too far behind in my opinion. Especially for this application.

I guess I will just have to see for myself.

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Aloha MX

I've seen the kapton tape builds.
And I've used the thermal epoxy.
I have zero actual experience with the tape so can't condemn or promote it.

But, I can say that the stars mounted with heatsink compound and bolts do run cooler than the thermal adhesive mounts according to my "Tempgun" readings from face of the emitters.

I don't math around much, I jus' measure.:)
Pragmatism uber alles appeals to da terminally lazy!:D

As for the tape?
"Good enough" is also a working model.:cool:
Time spent agonizing over nits, is time lost growing buds, yah?

Jus' my take on it.

Aloha Y'all
Weezard

Quote:

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Originally Posted by Weezard

Aloha MX

I've seen the kapton tape builds.
And I've used the thermal epoxy.
I have zero actual experience with the tape so can't condemn or promote it.

But, I can say that the stars mounted with heatsink compound and bolts do run cooler than the thermal adhesive mounts according to my "Tempgun" readings from face of the emitters.

I don't math around much, I jus' measure.:)
Pragmatism uber alles appeals to da terminally lazy!:D

As for the tape?
"Good enough" is also a working model.:cool:
Time spent agonizing over nits, is time lost growing buds, yah?

Jus' my take on it.

Aloha Y'all
Weezard

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Good enough is good enough for now. I can improve it later. Nice to hear from you Weezard. When I upgrade I'll probably have to bolt them down anyway since I'll want more light and it will mean a lot more heat. I am probably going to order one more blue LED for now since the PSU will support it. That makes 5 blue 460nm, 4 660nm, and 4 625nm. I figure it might help keep the plants a bit shorter anyway since most people advise a low dense grow with LEDs.

Peace