JasMoH
This was the most successful footprint that I tried. It has solder mask relief on the component side and the reverse, with the LED mounted upside down. Forgive me the Crusty soldering job. The LEDs have a substantial gap in this configuration that may necessitate some form of non-melting filler or clip to span the gap without the enormous solder globs.
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#PCB word clock :) it's feasible and shining through FR4 works fine as well :)
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You should check out the "surface mount - Bottom Entry" category of the Digikey LEDs
https://www.digikey.ca/products/en/optoelectronics/led-indication-discrete/105?k=&pkeyword=&pv69=441&FV=ffe00069&mnonly=0&ColumnSort=1000011&page=1&quantity=1&ptm=0&fid=0&pageSize=100
There actually are a lot of LEDs designed to be mounted upside-down! It's super cool
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