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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actually, yeah, that is a good idea... also keep using veg nutes for a bit before switching to bloom nutes...

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I'm using fox farms, so there feeding schedule has a week of veg nutes, mixed with a 1/2 strength start of bloom nutes. And then next week i start with strictly bloom nutes and that is when i will switch to the HPS.

Thanks for the quick response.

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sounds like ya got it covered...

best of luck !!!

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You know how it is, you hear so many things on the interwebs and i wanted to make sure this was in fact a good method. Thanks for the help

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sounds good... im doing my first indoor grow and started flowering under a 400W hps and saw my plants were streatching... I was so confused... I'm definetly going to try this next time!

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Keep the hps light closer to prevent the streching as well. Not too close as to hot. Put your hand on top to test the temps. I have a cooling tube cover that goes over the light so I can keep it pretty close.

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Will 1 week be enough with the MH or should i go longer before i switch to HPS?

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I switched to the HPS today. Keeping the MH in place for the first week of 12/12 worked great, very little stretch. I only got a few inches of vertical growth. They havent shown any real flower production yet but its only been a week.
I'm sure they will stretch much more during this second week and hopefully they start to show some flower production soon. I'm so excited, I cant wait to start to see them making progress towards flowering.

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Let us know how it goes with using MH during the first week of flowering. I hope you get a wonderful grow!

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