Just thinking aloud to mysrelf.  Should I add T5's to my current LED only set up?  What would be a nice retro kit ? I use a canopy, so It could be a DiY retro kit.  I only have room for 2 bulbs. most likely 1 in front/ 1 in back. LED down the middle.  if you only could pick 2 bulb colors, what would they be?  I'm considering adding theses for better growth and overall heath.  I think I get more than enough color/blue from the LED already.  Feel free to chime in,  Toss me some ideals... 