vetteguy53081
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White light is/ Most all coral need zooxanthellae which is their energy source, building blocks for color and growth. You dont want bright white unless SPS but moderate. Few out there have an all Zoa tank and even zoa require zooxanthellae.White light isn't necessary IMO, rather a tool that can be used to produce a specific result in certain coral.
FOR EXAMPLE: Zoas
Zoas can and will grow with out the use of white light, many hobbyists have been running all blue schedules for years now with great success.
BUT
By running white light along with your already blue spectrum for the first 4 hours of your photoperiod will create bigger Polyps. The theory is that Zoas utilize the white light for those first 4 hours and after they sense its "gone" they spread bigger in search of more of it.
No one really knows whats happening internally and have no scientific proof except observation. I've tested this with always the same result. Zoas under white light will get bigger. An awesome YouTuber by the name of EAT SLEEP REEF comments in one of his videos that any Zoa he puts in his tank grows bigger polyps than in any other tank.
I checked his light settings and guess what? He's running 4 hours of whites in the beginning of his photoperiod. Coincidence?