Efficacy aside, let me suggest that you add another red module.

Royal blue is a high energy frequency.
Red is quite low-energy, relatively.
Blue triggers photo-tropism, etc. but red light is the "workhorse" here.
If you add a red module, and you intend to flower with this light, let me suggest using 660nm. deep red.
They made little difference in veg., so I use the 627nm lights there.
In flower, however, the difference was notable.
Fatter, harder colas.

Only other advice that comes to mind is, do not cheap out on the heat-sink.
You need to move heat away from the emitters as rapidly as possible.
As the junction heat rises, efficiency fall off a cliff, and life expectancy takes a dive as well.
Protect your investment and get the most bang for your buck, brah.
Honkin' big heat-sink, with a muffin fan on a thermostat is a great investment at this point.

Check my albums for ideas.
http://boards.cannabis.com/members/weezard-albums-let-there-light-picture269761-under-one-roof.html
Learn from my mistakes

When you get it built, I'll have a link to a thread called.

Discussion of the pragmatic application of LED's

(hard to pass links here, so ya might wanna google dat)

Aloha,

Wee'zard