I believe ya
The bulb spectrum you are putting forth seems a little unbalanced to me as it wouldn't have enough blue/yellow and thus would be "poor quality" light by being unbalanced. Take a page from lucius and throw a 6500K in and you should be good, honestly i'd pitch a full red bulb if you had to pick one to drop, (having 1 bulb t5s units has really come in handy for me to supplement the larger units)
I, like lucius, can confirm great results from an arrangement like this:
coral 6500K
6500K coral
coral 6500K
6500k coral
(corals are coral wave) and yea I'm working with 2' bulbs, but I can put a gap in between my units without losing too much canopy coverage and the pair cover more than a 4' would in my particular setup. Also I was able to let my leaves touch the coral waves with no issues, maybe because I try to emulate mountain temperatures
hope this helps ya blueb,
MPP