There are several panels out there that can stand on their own... and rock it...
Area 51 being at the top of this list, with California Lightworks to follow. Apache... Etc.
...all these massive panels are running whites to some extent.. but we're looking for supplements, not Sun level PAR machines...
Astir is on the right track with their panels, made towards micro growers.. But look like they would rock for supping some spectra.
Browse the LED section... Go down 2-3 pages worth, read and absorb every bit you can. We are all constantly learning.
I will be purchasing a few of these panels myself... And I am already all led, the source of light, at that angle- is perfect for my scenario.