lighting needed for a 15gallon Nano?

[Beano1169]

So I have looked up some pricing on line and have read a little more on keeping SW nano tanks and I have decided that I may up grade to a :

12-1/2"L x 30-1/4"W x 13"H
24" 298W Metal Halide System Extendable Series
JBJ OCEANSTREAM OS101 - CIRCULATION PUMP 500 GPH

with my existing Fluval E series 50W heater, my koralia nano 240 gph power head and fuge modded ac110
Im just curious as to if this will be enough light and flow for the tank if I upgrade slightly, and I kinda just need a bit more wiggle room so i have a bit more dilution on my side