You wanted a serious answer? Sorry - OK, likely you can grow some macroalgae with this spectrum, but not really well from what I remember. Daylight/6500K (and enough of it) will do a better job.
And a 400W 13000K MH bulb should have as much punch as a used 175W (I would hope for more), in answer to another post of yours... is the 175 a 10K?
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Alan
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