I am guessing by 40" wide, you mean long (since its 70G tank)
Reefbreeders photon V2+ may not work, as it is between 32 and 48 units. 32 unit is good for up to 36" tank so you would have 2" low light areas on the sides. May or may not be an issue
Noopsyche K7 Pro II - 2-3 of these depending on what you have in the tank. 3 of these will cover whole tank and then some, and will grow anything coral wise. Each is rated for 24"x24" but work best for 18"x18" area.
AI, Kessils etc if you want to spend lots of money again.
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