i made some veg lights with these low end chinese leds
Smarter Shopping, Better Living! Aliexpress.com
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they work great.
i run them at 12-15 watts each. i run 3-4 in parallel on each driver. instead of heatsinks i bolt them on the backside of metal gang boxes with
M2.5 screws as they were cheap and work with the smaller 10w generic cobs as well.
i can run two of these clusters on an old 250W ATX supply from older P4 computers.
i am buiding a bigger light of 24 mostly warm color same model cobs.