mixing 3v white + 2v Red LEDS on a 5v Line?

Hi there, I have 900 electric vehicle adapters that put out exactly 5v + 2.0amps. I want to make use of them for led lighting.



Say Luxeon rebel LEDs: 3v White + 2v Red = 5v



Must the 3v and 2v have equal current, for example:

3v @ 700ma + 2v @ 700ma = 5v 1400ma



can i do 3v @1350ma + 2v @700ma = 5v @ 2000ma



can i carefully select 2v red and 3v white leds to logically coexist on a stable 5v rail?



What is the most efficient solution at putting white and red leds onto a small 5v adapter? use 2 of them to make 10v = 3*3.3v White + 4*2,5v Red?

I want to just use 5v not 10v!!



Thankyou!