All starbases use the same HP value, based on the Starbase hull found in GC2Types.xml.

since we are talking about starbase hps here i would like to say that starbase hit points are to low and need to be beefed up during the game with constructers

Umm....I can't find that line. Is it near the ship hulls?

The only entry with the word 'starbase' in GC2Types.xml is ConstructorModule.
Nothing about the actual starbase hull.

However, in GC2Ships.xml there is this:

[Ship Name="Starbase"]
[DisplayName]Starbase[/DisplayName]
[Model]Starbase[/Model]
[Description]Starbases expand your resources and extend your influence.[/Description]
[Tech_Requirement]ImpossibleTech[/Tech_Requirement]
[Component]LargeHull0[/Component]
[Ability]Starbase[/Ability]
[/Ship]

As you can see, it uses the LargeHull0 - which is in the GC2Types.xml - with a model for a starbase, as well as the Starbase ability.

So starbases should gain their hitpoints through the LargeHull0 specs.