Do white lights ever need to be on?

[ReefGuy1234]

I don’t enjoy white lights so, do they ever need to be on? I think my whites are on maybe 6 hrs and blues 8 or more hours but I just like see every in blue.

 

[Fishology]

I believe some light you can lower the strength of light, so you can do that to have more blue or you can just cut it off all my coral are fine with only blue light it’s just harder to see