Question about cooper DTP vs aluminium sink

I took a measurement with a Fluke E4 from a running SST-90@9A.

The emitter is mounted on the stock 20mm star from Luminus, which is made from aluminium.

More details from the entire build: https://budgetlightforum.com/t/-/46525



Would an upgrade with a copper DTP bring really an improvement?

(I saw thermal images from hard driven emitters, mounted on aluminium sink, which exceed +90°C and above.)

What do think?

Your pic doesn’t work :wink:

The current density which you are running the LED at has a lot to do with it. The SST-90 is a large LED and you are only driving it at 1A/mm^2. So the benefit will probably be a bit smaller. But it should still make measureable difference!

wow nice, interesting to see those blue spots so close to the LED
Thanks

Plastic centering ring?

The blue spots are from the silicon cables.

The package of the SST 90 is over 10 times bigger than 3535 footprints with their tiny thermal pad

SST90 45.9mm²
5.1x9mm
9A 0,7W/mm²

XPL 4.29mm² thermal pad
1.3x3.3mm
3A 2,5W/mm²

Even it it gets you just 10°C difference, I think it’s still worth it. It’s a 3$ upgrade…
It will make your light more robust, even when used in extreme climates. As long as can hold the flashlight without burning yourself the LED will never become too hot.

What I noticed is that the red zone is not spreading. With a DTP star I would expect that to spread and maybe take up most of the star allowing it to transfer heat from the entire star into the underlying pill or shelf.

Here is your answer:

https://www.aliexpress.com/item/20mm-Cooper-PCB-Cree-MTG-2-MKR-XHP50-6V-12V-XHP70-5V-12V-MKR-led-PCB/32794872927.html?spm=2114.search0104.3.25.sTLTsJ&ws_ab_test=searchweb0_0,searchweb201602_5_10152_10065_10151_10068_10193_10194_10308_10304_10137_10060_10302_10155_438_10154_10056_10055_10054_10059_100031_10099_10103_10102_10101_10052_10053_10142_10107_10050_10051_10084_10083_10119_10080_10082_10081_10177_10110_10111_10112_10113_10114_10180_10182_10184_10078_10079_9894_10073_10186_10120_5360020-10152_10111_9894_10120,searchweb201603_13,ppcSwitch_4&btsid=07413289-c6e2-4183-94f6-525ce22b118d&algo_expid=3d00d27e-c8af-4006-bae8-236ff7d5e929-3&algo_pvid=3d00d27e-c8af-4006-bae8-236ff7d5e929

DTP stars are cheap here