What colors do you need?

This depends on what colors of fish you have in the tank. Some warmer lights will help the warmer colored fish like yellows and oranges show up better. If you want the tank to look more like the sea then you'll go for a darker color light. It is about preference really.

When it comes to the type of light that you want for your tank it is depending on the kind of look you are wanting, some prefer warmer lights and others prefer them to be brighter or even whiter.

I would say go with what you prefer so that you are happy.