Considering the topics I have seen on hps/mh combo and cmh(wide spectrum) grows, a mixed spectrum certainly doesn't hurt BUT those lamps are high output whereas most cfl's are weak sauce.
Some say all red. Some say 2:1 red heavy. Some say 3:1 red heavy. I'm currently experimenting with 2 42w 2700k and 1 45w 4100k on a 12/12 from seed.
Just get the highest lumen output red lamps you can find. If the 4100k wasn't greater than or equal to my 2700's I wouldn't have bought it.