Scorpion diablo X

I doubt that. The H is a Samsung Marketing strategy to target the horticulture industry. They rebranded the LM301B as LM301H without changing anything else.

The point in mixing 3500K with 5000K (or any other CCT) is availavility/cost savings. There are only so many top bins available. By choosing a less popular CCT you have access to higher bins or equivalent bins for cheaper.
Not talking about the H, I'm talking about the H-EVO.
 
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