6500k is the best for growth. so 10k is better for growth than 16k. however 16k-20k has brighter more neon colors. so choose what you want, better growth or color. :mixed:
my mini reef has 20k, 10k-15k actinic and 1 color changing RGB led. i make the color changing led blue when i want to see better color, but most of the day i change the rgb to a 6500k-4000k mix cause my led has 16 colors to choose from. i noticed my coral happier when i had the led at 6500k vs the blue. the cool thing is my 20k and 10-15k led bulbs are always the same color so i get the best of both worlds thanks to amazing leds.