depends on your coral species choice. For your tank , 02 150 W double end MH would be great , both in 10000 or 20000 K color temp. Suplement with actinic blue is not really necessary but if you like blue glow on your corals, you can supplement with one or two bulbs (both NO or VHO) . Single end MH will require higher wattage as their lumens rate (efficiency) is lower than double ended MH ( at least 2 , 175 W bulbs). If you will set up an aquarium for mushrooms, soft corals and some large polyps stone corals , you also can consider setting up your system with VHO bulbs (4 to 6 bulbs) . So decide the coral species you wish to keep, then set up your lighting...