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State of the art LED

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TDC:
I got into LED's the last year....
Here are some of the most efficient available and they don't need a heatsink!  https://www.bridgelux.com/sites/default/files/resource_media/DS131%20Bridgelux%20EB%20Series%20Gen2%20Data%20Sheet%2020171020%20Rev%20A.pdf

https://www.digikey.com/products/en/optoelectronics/led-lighting-cobs-engines-modules/111?k=&pkeyword=&s=60762&FV=ffe0006f%2Cfffc03d0&mnonly=0&ColumnSort=0&page=1&quantity=0&ptm=0&fid=0&pageSize=25

A good cheap power supply. As I recall, I measured efficiency at about 90%.  https://www.ebay.com/itm/250W-DC-Step-up-Boost-Converter-Constant-Current-Power-Supply-LED-Driver-10-50V/142614882688?rt=nc&_trkparms=aid%3D222007%26algo%3DSIM.MBE%26ao%3D2%26asc%3D47300%26meid%3D300207d31f49449da6ac8e52961ea71a%26pid%3D100005%26rk%3D4%26rkt%3D6%26sd%3D172373295528&_trksid=p2047675.c100005.m1851

Mary B:
Sounds like they get pretty hot, as a minimum I would mount them on an aluminum sheet to act as a heat sink...

TDC:
Why do you think so? Suspended horizontally in still air I measured 112F.  You will have a hard time finding more efficient LED lighting.
Try one, you'll like it. https://www.arrow.com/en/products/bxeb-l0280z-35e1000-c-b3/bridgelux

Bruce S:
The heat you're feeling is the electronics keeping those diodes on. The cooler you keep them the longer they will last.

dnix71:
The strip they are mounted on is the heat sink. It's like your laptop computer now. The entire shell is a heat sink. That's why better laptops are made of aluminum instead of plastic. It conducts heat well, so the entire laptop will be the same temperature even with no air flow.

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