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Why? I've seen them all and opinions are not facts.Do you have anything to say about the videos and the points I made in regards to observations and experiences?
Everyones experiences are limited by a small set of circumstances unless they tested 100's of types of light over dozens of years.
I believe many grew corals just fine w/ 4000k HPS's.. Would you do that today?
Each is different w/it's own strengths and weakness .. None is "superior" over a wide range of needs/wants.
It really is that simple..