Lighting on this forum is like politics. Nobody changes their mind, but everyone gets all fired up.
I have something to offer in this “debate” and I wonder if others have had similar experiences.
I have a 6 foot SPS tank that’s mostly acros and a closet full of T5, LED, and halide gear. I like to switch up the lighting and watch how the corals respond.
With halides in the mix, colors get deeper, and tissue appears thicker and healthier.
When I pull the halides down and only run T5 and LED, there is always a color shift. I keep the par at the sanded at 300, regardless of which light combination I’m running.
T5 and LED probably develop the best coloration under blues, but the colors are less rich and deep without halides. The corals look more robust with halides in the mix, and slow growers tend to do better.
I switch up the lights more than I should, and the acros always respond to the change. There is a difference. What is “best” is a matter of opinion.