Lighting over a 24in 6foot tank?

[Milad]

So currently I have an corallife aqualight 150 pro over my 180

its got 13k 150w giesemann for the MH
it also has 4 PC actinics

The bulbs are coming up for replacement and I want to get some ideas what you guys would go with

I like the bluer look over the white

people are saying 14k phoenix for the MH

since the tank is 24in I want to make sure enough light is going into it. So could i replace the actinic with 50/50 bulbs (10k and true actinic)

Whats the downside?

Ive also been eying the DIY LED option but probably wont touch that until next year.