So I have two females and I'm switching to 12/12 today. I have a 400W dual ballast that can use a MH or a HPS. I have both bulbs. I read somewhere that although the HPS is the best for flowering, it can be better to use the MH for the first week of flowering(12/12) in order to prevent the stretch of the plants.
Is it sound advice to use the MH for the first week or two and then switch to the HPS or should i change the HPS today and use it all through flowering?

Thanks in advance

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