I've been checking this out at the LFS. They have had great success with a pink (Kessil A80). There are supposed to be some interesting articles online that support this.
You're probably going to get a lot of different answers. I believe daylight, around 5500K is the best for macros. Most macros grow in shallow water. Some of the reds grow in deeper water, so they may do well in bluer light.
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