lighting for low tank

[Fishguy52]

Hey, I was just wondering if any on could help me out I have a 70 gal tank that I just stared up and was wondering about some lighting options for going reef. The tank is 51”L x 20”W x 16”H and I have 2 x 40 watt NO and a 96 pc from my old 35 gal.
If I replace the pc with a 400-watt MH HQI is that going to be good for a soft tank or can I get a way with another kind maybe less money.