Best K rating for reef tank lights

[justinl]

the 6700 K is best for just growth but colour wont be very nice. 20000 K makes colours pop but growth slows down. anything in between is a compromise between growth and colour. Myself, I like 15000 K (no other supplemental lights), but what you proritize (growth or colour) is very subjective.

i dont know that i would ever call any light coming out of an artificial bulb "natural sunlight." That's like teh comparison of our tanks to the ocean; it just doesn't really compare.