Mixing DE HPS with MH in flowering

im going to run 2 DE gavitas in my 9x5x8 tent Scrog. HPS

In my last tent with single ended, I mixed the spectrum. For every 600 watts of HPS I had a 400watt mh.
This is said to do many things.

What are the thoughts on adding a mh in between my two gavitas? If I control heat etc, I think it should help me get those rock hard buds I'm used to with mixed spectrum lighting
 
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