Investing in additional, whats my best choice??

So im planning on adding some additional lighting to my setup and I few ideas in mind i'm just not sure what to get. Right now I have a 150 watt hps and I'm thinking either buy another 150 watt hps or possibly a 90 watt LED round grow light to supplement UV rays. Input and other ideas are greatly appreciated, thanks!
 
I would spend a little extra on LED if you go that route and get the 180w blackstar with 3w chipsets.
 
I would go with a 400 or 600 watt but they're pretty expensive, use a lot of power and i'm afraid they'd get too hot because my grow space is about 2'L x 2'W x 5'6"H. I also only have two plants so i think 600 would be a lil overkill lol 400 has def crossed my mind though do you think that be too much for the space givin?
 
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