Let’s compile a list. I’m speaking of single die type emitters, not COB. If you have a source for the LED you mention feel free to leave a link as well.
I will start… I’ve created a google sheet that I’m adding to. I would love to have a few volunteers to help EDIT the sheet. If you want to have edit privilege’s PM me your email and I will add you as an editor.
The FFL505A is a funny one. It has a round light-emitting surface, but technically a square die. It only appears round because the corners of the square were covered with opaque silicone mask, which is part of the reason for its low efficacy.
EDIT: it actually has a round die, the FFL350RD is the square one. Thanks crbnfbr and koef3 for the correction!
Excellent, I have added both W5050SQ3, and the FFL505A. I’ve also included a line on the spreadsheet that links to independant tests of the LEDs. I found some here at BLF done by koef3LED tester