I'm not running optics on any of mine. But I would tend to think that the blue leds pack more of a punch than whites in terms of energy that corals use. Its interesting that whites caused corals to bleach.

I'm frankly still a bit unclear on white LEDs anyways...as I understand it they are simply blues with a phosphorus coating making it look white. If light looks white, does that mean its white? White light technically have all the color spectrum, right?

It seems like one has to be a quantum physicists with a masters in biology to put all of this information together into something that makes sense.