We use Brite Lite here in Calgary ... should have something similar in your neck of the woods ... Workhorse 7 electronic ballasts for the VHO's ... and a tar ballast will work for the Metal Halides ... I run 6500K and 10K bulbs on mine. With VHO and MH you will be able to have most every coral ... they say the spread of a MH is about 2 sq ft but you can add more later
Cheers