Aloha Rosc2112,

LEDs are easy to wire.
No gotta be an engineer.:tin foil hat:

Take 5 red Crees, wire in series + to -.
Take 5 more, same thing.
Then wire 3 blue LEDs in series.
Add a 1 ohm 5 Watt resistor to the blue string.
Tie all three strings together (parallel) matching polarity + to +, - to -.

Mount it all on a hefty heatsink.
No gotta calculate, Overkill will do jus' fine.

Feed them from a standard 12.5V DC 4A. power supply.
Will draw about 3.4 Amps.

That will build a quick n dirty, 42.5 Watt grow light ,that will work very well for 2 to 4 plants.

If you want it to last longer, run cooler and be more efficient...

Buy some LM317 variable voltage regulators and wire them as constant current regs.
You'll find the circuit and formula in the datasheet.
Solder a resistor between the output pin and the adjust pin.
Then connect your LEDs + to the ADJ. pin.
Calculate resistor value to to supply LESS than the Imax of your LEDs.
I usually run 'em a 75% -80%, for efficiency.

That what you're looking for?

Regards,
Weezard