You run blue longer than white in a reef tank simply because people try to use that as a morning/evening transition. Nothing more. Photosynthetic creatures need a certain amount of light, for a certain amount of time, and that's it. Running blue lights longer is not helping anything. I've also used hydroponics fixtures over a reef tank instead of the aquarium ones (the difference is there is only 1 cord, and hydroponics fixtures have larger reflectors), and had an immediate on/off for the life of the tank. Fish and corals grew and lived just fine.
I notice on my tank now when the blues go on, fish freak just as when the daylights go on. It doesn't keep them calm at all. The only way you could get that to stop happening is if you used a self dimming LED
fixture that did that for you, gradually. It's not necessary though.