DIY LED Replacement Question

Hi,

I have a fixture that i purchased second hand that i want to alter. it is an XpressDIY.com led fixture, which is built by having aluminum strips with printed circuits in them running to evenly spaced LEDs that are then mounted to the strip, then strip to the heat sink with fan.




My question is: I have 12 3w Cree royal Blue LEDs currently, and 24 RGB 3w (1w per channel) LEDs. I've been reading that the RGB LEDs aren't going to be as effective at growing corals, so i want to replace them with a mix of cool white, warm white and 470nm blue LEDs. the question comes from the picture below:






each LED has a printed circuit for each color so that they can be controlled separately, but I’d like to utilize only 2 of those circuits (one for the whites, one for the blues)
is there any reason why i can't just solder in the LEDS to just a single channel? will 3.8v@700mA be too much for the apparent size?

Also, i've been wondering if i should have some UV or violet LEDs in there?

thoughts?

thanks for your time,

Jared