What Are the Best Lights for Cloning?

Can somebody please tell me what they feel are the best lights for cloning? A Kelvin temp would be appreciated.
~ D

I use 4 cool blue 6500k and 2 warm lights 2700k for mine... but the cloner is with the veg...

T5 HO fixtures put out a great deal of light. Low Cost to run, almost no heat.