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Topic: Best mounting for 3W PCB LEDs? (Read 256 times) previous topic - next topic

wallup

Hi all, anyone have a preferred way of mounting these high power LEDs into projects? I need to install quite a few of them onto alu flat bar for a project, so I'd prefer to avoid multi-step mechanical connections. JB weld? Epoxy? Their on-time in the project is very low but I'd like to be able to keep them lit for longer intervals during trouble shooting, so using the alu bar as heat-sink extension is important. Thanks!


wallup

aaaannndd never mind :)

https://www.amazon.com/BCP-Adhesive-Thermal-Conductive-Heatsink/dp/B01MSL64XG

Wawa


DrAzzy

#3
Oct 07, 2019, 04:49 am Last Edit: Oct 07, 2019, 04:49 am by DrAzzy
aaaannndd never mind :)

https://www.amazon.com/BCP-Adhesive-Thermal-Conductive-Heatsink/dp/B01MSL64XG
The tape is kinda lousy as a thermal conductor; I would recommend:

Arctic Alumina Thermal Adhesive or Arctic Silver Thermal Adhesive, and be sure to press them down good when gluing them down (you want the layer of adhesive to be as thin as possible). (those are the search terms to use in Amazon etc to find them)
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MarkT

#4
Oct 07, 2019, 04:24 pm Last Edit: Oct 07, 2019, 04:25 pm by MarkT
Super glue (cyanoacrylate) will work better for heat conduction (but more brittle mechanically - not great for
lots of vibration alas).
Super glue can be squeezed down to a very thin film, and with flat surfaces this means good heat conduction
(emery paper the LEDs and bar first for best results).

Its relatively easy to pry off again and rework if you have to.

I'd suggest soldering the LEDs together first, otherwise your iron will be fighting the heatsinking,
destroying the glue and generating cyanide fumes.

For high vibration use bolts and nylok nuts.
[ I will NOT respond to personal messages, I WILL delete them, use the forum please ]

DrAzzy

I'm pretty sure plain old superglue is worse for thermal conduction compared to thermal epoxies. It might work, but it might not - you can always test it out, 3W LEDs are cheap, so if you burn one out, no biggie.
ATTinyCore for x4/x5/x61/x7/x8/x41/1634/828/x313 megaTinyCore for the megaavr ATtinies - Board Manager:
http://drazzy.com/package_drazzy.com_index.json
ATtiny breakouts, mosfets, awesome prototyping board in my store http://tindie.com/stores/DrAzzy

larryd

I use high temperature liquid steel glue/epoxy.

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wallup

Hey all thanks for all the thoughts on this. I will definitely try to Arctic products next time around, and will give the CA glue a shot this time as well as the cheapo thermal tape. Short on-times should protect me from too much regret :)

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