Violets and Acropora

[Naturalreef]

For the millionth time a cool white LED is just a royal blue LED with a little bit of green phosphor and a minuscule amount of orange red. For all intents and purposes you might as well call a cool white LED a royal blue because from the corals perspective that's what it is.

White is not a wavelength. Covered in grade school science class.

Theres been no scientific evidence that violet light or any blue other than 450nm has a darn thing to do with SPS growth. Back before the days of LED nobody lit their SPS tanks with 420nm actinic tubes with the intent of promoting growth. Just make it look cooler. If you were to average the spectra of every reef light over a showcase SPS tank that ever existed you would see mostly a 450nm spike and a smidge of everything else.

Basically you bought a light with a couple violet chinese diodes and are trying to create justification for them. The amount of radiation these lights emit between 400-440 is trivial anyways.

A little harsh don’t you think? This is a hobby to share knowledge, not belittle. I was really enjoying this conversation until the teacher came into the room.